SemaDeclCXX.cpp revision 8d051e00ad674754d476cc1fa0442da0bc47b2c8
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 unsigned DiagDefaultParamID = 297 diag::err_param_default_argument_redefinition; 298 299 // MSVC accepts that default parameters be redefined for member functions 300 // of template class. The new default parameter's value is ignored. 301 Invalid = true; 302 if (getLangOptions().Microsoft) { 303 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 304 if (MD && MD->getParent()->getDescribedClassTemplate()) { 305 DiagDefaultParamID = diag::war_param_default_argument_redefinition; 306 Invalid = false; 307 } 308 } 309 310 // int f(int); 311 // void g(int (*fp)(int) = f); 312 // void g(int (*fp)(int) = &f); 313 Diag(NewParam->getLocation(), DiagDefaultParamID) 314 << NewParam->getDefaultArgRange(); 315 316 // Look for the function declaration where the default argument was 317 // actually written, which may be a declaration prior to Old. 318 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 319 Older; Older = Older->getPreviousDeclaration()) { 320 if (!Older->getParamDecl(p)->hasDefaultArg()) 321 break; 322 323 OldParam = Older->getParamDecl(p); 324 } 325 326 Diag(OldParam->getLocation(), diag::note_previous_definition) 327 << OldParam->getDefaultArgRange(); 328 } else if (OldParam->hasDefaultArg()) { 329 // Merge the old default argument into the new parameter. 330 // It's important to use getInit() here; getDefaultArg() 331 // strips off any top-level ExprWithCleanups. 332 NewParam->setHasInheritedDefaultArg(); 333 if (OldParam->hasUninstantiatedDefaultArg()) 334 NewParam->setUninstantiatedDefaultArg( 335 OldParam->getUninstantiatedDefaultArg()); 336 else 337 NewParam->setDefaultArg(OldParam->getInit()); 338 } else if (NewParam->hasDefaultArg()) { 339 if (New->getDescribedFunctionTemplate()) { 340 // Paragraph 4, quoted above, only applies to non-template functions. 341 Diag(NewParam->getLocation(), 342 diag::err_param_default_argument_template_redecl) 343 << NewParam->getDefaultArgRange(); 344 Diag(Old->getLocation(), diag::note_template_prev_declaration) 345 << false; 346 } else if (New->getTemplateSpecializationKind() 347 != TSK_ImplicitInstantiation && 348 New->getTemplateSpecializationKind() != TSK_Undeclared) { 349 // C++ [temp.expr.spec]p21: 350 // Default function arguments shall not be specified in a declaration 351 // or a definition for one of the following explicit specializations: 352 // - the explicit specialization of a function template; 353 // - the explicit specialization of a member function template; 354 // - the explicit specialization of a member function of a class 355 // template where the class template specialization to which the 356 // member function specialization belongs is implicitly 357 // instantiated. 358 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 359 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 360 << New->getDeclName() 361 << NewParam->getDefaultArgRange(); 362 } else if (New->getDeclContext()->isDependentContext()) { 363 // C++ [dcl.fct.default]p6 (DR217): 364 // Default arguments for a member function of a class template shall 365 // be specified on the initial declaration of the member function 366 // within the class template. 367 // 368 // Reading the tea leaves a bit in DR217 and its reference to DR205 369 // leads me to the conclusion that one cannot add default function 370 // arguments for an out-of-line definition of a member function of a 371 // dependent type. 372 int WhichKind = 2; 373 if (CXXRecordDecl *Record 374 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 375 if (Record->getDescribedClassTemplate()) 376 WhichKind = 0; 377 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 378 WhichKind = 1; 379 else 380 WhichKind = 2; 381 } 382 383 Diag(NewParam->getLocation(), 384 diag::err_param_default_argument_member_template_redecl) 385 << WhichKind 386 << NewParam->getDefaultArgRange(); 387 } 388 } 389 } 390 391 if (CheckEquivalentExceptionSpec(Old, New)) 392 Invalid = true; 393 394 return Invalid; 395} 396 397/// \brief Merge the exception specifications of two variable declarations. 398/// 399/// This is called when there's a redeclaration of a VarDecl. The function 400/// checks if the redeclaration might have an exception specification and 401/// validates compatibility and merges the specs if necessary. 402void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 403 // Shortcut if exceptions are disabled. 404 if (!getLangOptions().CXXExceptions) 405 return; 406 407 assert(Context.hasSameType(New->getType(), Old->getType()) && 408 "Should only be called if types are otherwise the same."); 409 410 QualType NewType = New->getType(); 411 QualType OldType = Old->getType(); 412 413 // We're only interested in pointers and references to functions, as well 414 // as pointers to member functions. 415 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 416 NewType = R->getPointeeType(); 417 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 418 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 419 NewType = P->getPointeeType(); 420 OldType = OldType->getAs<PointerType>()->getPointeeType(); 421 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 422 NewType = M->getPointeeType(); 423 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 424 } 425 426 if (!NewType->isFunctionProtoType()) 427 return; 428 429 // There's lots of special cases for functions. For function pointers, system 430 // libraries are hopefully not as broken so that we don't need these 431 // workarounds. 432 if (CheckEquivalentExceptionSpec( 433 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 434 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 435 New->setInvalidDecl(); 436 } 437} 438 439/// CheckCXXDefaultArguments - Verify that the default arguments for a 440/// function declaration are well-formed according to C++ 441/// [dcl.fct.default]. 442void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 443 unsigned NumParams = FD->getNumParams(); 444 unsigned p; 445 446 // Find first parameter with a default argument 447 for (p = 0; p < NumParams; ++p) { 448 ParmVarDecl *Param = FD->getParamDecl(p); 449 if (Param->hasDefaultArg()) 450 break; 451 } 452 453 // C++ [dcl.fct.default]p4: 454 // In a given function declaration, all parameters 455 // subsequent to a parameter with a default argument shall 456 // have default arguments supplied in this or previous 457 // declarations. A default argument shall not be redefined 458 // by a later declaration (not even to the same value). 459 unsigned LastMissingDefaultArg = 0; 460 for (; p < NumParams; ++p) { 461 ParmVarDecl *Param = FD->getParamDecl(p); 462 if (!Param->hasDefaultArg()) { 463 if (Param->isInvalidDecl()) 464 /* We already complained about this parameter. */; 465 else if (Param->getIdentifier()) 466 Diag(Param->getLocation(), 467 diag::err_param_default_argument_missing_name) 468 << Param->getIdentifier(); 469 else 470 Diag(Param->getLocation(), 471 diag::err_param_default_argument_missing); 472 473 LastMissingDefaultArg = p; 474 } 475 } 476 477 if (LastMissingDefaultArg > 0) { 478 // Some default arguments were missing. Clear out all of the 479 // default arguments up to (and including) the last missing 480 // default argument, so that we leave the function parameters 481 // in a semantically valid state. 482 for (p = 0; p <= LastMissingDefaultArg; ++p) { 483 ParmVarDecl *Param = FD->getParamDecl(p); 484 if (Param->hasDefaultArg()) { 485 Param->setDefaultArg(0); 486 } 487 } 488 } 489} 490 491/// isCurrentClassName - Determine whether the identifier II is the 492/// name of the class type currently being defined. In the case of 493/// nested classes, this will only return true if II is the name of 494/// the innermost class. 495bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 496 const CXXScopeSpec *SS) { 497 assert(getLangOptions().CPlusPlus && "No class names in C!"); 498 499 CXXRecordDecl *CurDecl; 500 if (SS && SS->isSet() && !SS->isInvalid()) { 501 DeclContext *DC = computeDeclContext(*SS, true); 502 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 503 } else 504 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 505 506 if (CurDecl && CurDecl->getIdentifier()) 507 return &II == CurDecl->getIdentifier(); 508 else 509 return false; 510} 511 512/// \brief Check the validity of a C++ base class specifier. 513/// 514/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 515/// and returns NULL otherwise. 516CXXBaseSpecifier * 517Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 518 SourceRange SpecifierRange, 519 bool Virtual, AccessSpecifier Access, 520 TypeSourceInfo *TInfo, 521 SourceLocation EllipsisLoc) { 522 QualType BaseType = TInfo->getType(); 523 524 // C++ [class.union]p1: 525 // A union shall not have base classes. 526 if (Class->isUnion()) { 527 Diag(Class->getLocation(), diag::err_base_clause_on_union) 528 << SpecifierRange; 529 return 0; 530 } 531 532 if (EllipsisLoc.isValid() && 533 !TInfo->getType()->containsUnexpandedParameterPack()) { 534 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 535 << TInfo->getTypeLoc().getSourceRange(); 536 EllipsisLoc = SourceLocation(); 537 } 538 539 if (BaseType->isDependentType()) 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543 544 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 545 546 // Base specifiers must be record types. 547 if (!BaseType->isRecordType()) { 548 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 549 return 0; 550 } 551 552 // C++ [class.union]p1: 553 // A union shall not be used as a base class. 554 if (BaseType->isUnionType()) { 555 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 556 return 0; 557 } 558 559 // C++ [class.derived]p2: 560 // The class-name in a base-specifier shall not be an incompletely 561 // defined class. 562 if (RequireCompleteType(BaseLoc, BaseType, 563 PDiag(diag::err_incomplete_base_class) 564 << SpecifierRange)) { 565 Class->setInvalidDecl(); 566 return 0; 567 } 568 569 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 570 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 571 assert(BaseDecl && "Record type has no declaration"); 572 BaseDecl = BaseDecl->getDefinition(); 573 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 574 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 575 assert(CXXBaseDecl && "Base type is not a C++ type"); 576 577 // C++ [class]p3: 578 // If a class is marked final and it appears as a base-type-specifier in 579 // base-clause, the program is ill-formed. 580 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 581 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 582 << CXXBaseDecl->getDeclName(); 583 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 584 << CXXBaseDecl->getDeclName(); 585 return 0; 586 } 587 588 if (BaseDecl->isInvalidDecl()) 589 Class->setInvalidDecl(); 590 591 // Create the base specifier. 592 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 593 Class->getTagKind() == TTK_Class, 594 Access, TInfo, EllipsisLoc); 595} 596 597/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 598/// one entry in the base class list of a class specifier, for 599/// example: 600/// class foo : public bar, virtual private baz { 601/// 'public bar' and 'virtual private baz' are each base-specifiers. 602BaseResult 603Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 604 bool Virtual, AccessSpecifier Access, 605 ParsedType basetype, SourceLocation BaseLoc, 606 SourceLocation EllipsisLoc) { 607 if (!classdecl) 608 return true; 609 610 AdjustDeclIfTemplate(classdecl); 611 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 612 if (!Class) 613 return true; 614 615 TypeSourceInfo *TInfo = 0; 616 GetTypeFromParser(basetype, &TInfo); 617 618 if (EllipsisLoc.isInvalid() && 619 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 620 UPPC_BaseType)) 621 return true; 622 623 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 624 Virtual, Access, TInfo, 625 EllipsisLoc)) 626 return BaseSpec; 627 628 return true; 629} 630 631/// \brief Performs the actual work of attaching the given base class 632/// specifiers to a C++ class. 633bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 634 unsigned NumBases) { 635 if (NumBases == 0) 636 return false; 637 638 // Used to keep track of which base types we have already seen, so 639 // that we can properly diagnose redundant direct base types. Note 640 // that the key is always the unqualified canonical type of the base 641 // class. 642 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 643 644 // Copy non-redundant base specifiers into permanent storage. 645 unsigned NumGoodBases = 0; 646 bool Invalid = false; 647 for (unsigned idx = 0; idx < NumBases; ++idx) { 648 QualType NewBaseType 649 = Context.getCanonicalType(Bases[idx]->getType()); 650 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 651 if (!Class->hasObjectMember()) { 652 if (const RecordType *FDTTy = 653 NewBaseType.getTypePtr()->getAs<RecordType>()) 654 if (FDTTy->getDecl()->hasObjectMember()) 655 Class->setHasObjectMember(true); 656 } 657 658 if (KnownBaseTypes[NewBaseType]) { 659 // C++ [class.mi]p3: 660 // A class shall not be specified as a direct base class of a 661 // derived class more than once. 662 Diag(Bases[idx]->getSourceRange().getBegin(), 663 diag::err_duplicate_base_class) 664 << KnownBaseTypes[NewBaseType]->getType() 665 << Bases[idx]->getSourceRange(); 666 667 // Delete the duplicate base class specifier; we're going to 668 // overwrite its pointer later. 669 Context.Deallocate(Bases[idx]); 670 671 Invalid = true; 672 } else { 673 // Okay, add this new base class. 674 KnownBaseTypes[NewBaseType] = Bases[idx]; 675 Bases[NumGoodBases++] = Bases[idx]; 676 } 677 } 678 679 // Attach the remaining base class specifiers to the derived class. 680 Class->setBases(Bases, NumGoodBases); 681 682 // Delete the remaining (good) base class specifiers, since their 683 // data has been copied into the CXXRecordDecl. 684 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 685 Context.Deallocate(Bases[idx]); 686 687 return Invalid; 688} 689 690/// ActOnBaseSpecifiers - Attach the given base specifiers to the 691/// class, after checking whether there are any duplicate base 692/// classes. 693void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 694 unsigned NumBases) { 695 if (!ClassDecl || !Bases || !NumBases) 696 return; 697 698 AdjustDeclIfTemplate(ClassDecl); 699 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 700 (CXXBaseSpecifier**)(Bases), NumBases); 701} 702 703static CXXRecordDecl *GetClassForType(QualType T) { 704 if (const RecordType *RT = T->getAs<RecordType>()) 705 return cast<CXXRecordDecl>(RT->getDecl()); 706 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 707 return ICT->getDecl(); 708 else 709 return 0; 710} 711 712/// \brief Determine whether the type \p Derived is a C++ class that is 713/// derived from the type \p Base. 714bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 715 if (!getLangOptions().CPlusPlus) 716 return false; 717 718 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 719 if (!DerivedRD) 720 return false; 721 722 CXXRecordDecl *BaseRD = GetClassForType(Base); 723 if (!BaseRD) 724 return false; 725 726 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 727 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 728} 729 730/// \brief Determine whether the type \p Derived is a C++ class that is 731/// derived from the type \p Base. 732bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 733 if (!getLangOptions().CPlusPlus) 734 return false; 735 736 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 737 if (!DerivedRD) 738 return false; 739 740 CXXRecordDecl *BaseRD = GetClassForType(Base); 741 if (!BaseRD) 742 return false; 743 744 return DerivedRD->isDerivedFrom(BaseRD, Paths); 745} 746 747void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 748 CXXCastPath &BasePathArray) { 749 assert(BasePathArray.empty() && "Base path array must be empty!"); 750 assert(Paths.isRecordingPaths() && "Must record paths!"); 751 752 const CXXBasePath &Path = Paths.front(); 753 754 // We first go backward and check if we have a virtual base. 755 // FIXME: It would be better if CXXBasePath had the base specifier for 756 // the nearest virtual base. 757 unsigned Start = 0; 758 for (unsigned I = Path.size(); I != 0; --I) { 759 if (Path[I - 1].Base->isVirtual()) { 760 Start = I - 1; 761 break; 762 } 763 } 764 765 // Now add all bases. 766 for (unsigned I = Start, E = Path.size(); I != E; ++I) 767 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 768} 769 770/// \brief Determine whether the given base path includes a virtual 771/// base class. 772bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 773 for (CXXCastPath::const_iterator B = BasePath.begin(), 774 BEnd = BasePath.end(); 775 B != BEnd; ++B) 776 if ((*B)->isVirtual()) 777 return true; 778 779 return false; 780} 781 782/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 783/// conversion (where Derived and Base are class types) is 784/// well-formed, meaning that the conversion is unambiguous (and 785/// that all of the base classes are accessible). Returns true 786/// and emits a diagnostic if the code is ill-formed, returns false 787/// otherwise. Loc is the location where this routine should point to 788/// if there is an error, and Range is the source range to highlight 789/// if there is an error. 790bool 791Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 792 unsigned InaccessibleBaseID, 793 unsigned AmbigiousBaseConvID, 794 SourceLocation Loc, SourceRange Range, 795 DeclarationName Name, 796 CXXCastPath *BasePath) { 797 // First, determine whether the path from Derived to Base is 798 // ambiguous. This is slightly more expensive than checking whether 799 // the Derived to Base conversion exists, because here we need to 800 // explore multiple paths to determine if there is an ambiguity. 801 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 802 /*DetectVirtual=*/false); 803 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 804 assert(DerivationOkay && 805 "Can only be used with a derived-to-base conversion"); 806 (void)DerivationOkay; 807 808 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 809 if (InaccessibleBaseID) { 810 // Check that the base class can be accessed. 811 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 812 InaccessibleBaseID)) { 813 case AR_inaccessible: 814 return true; 815 case AR_accessible: 816 case AR_dependent: 817 case AR_delayed: 818 break; 819 } 820 } 821 822 // Build a base path if necessary. 823 if (BasePath) 824 BuildBasePathArray(Paths, *BasePath); 825 return false; 826 } 827 828 // We know that the derived-to-base conversion is ambiguous, and 829 // we're going to produce a diagnostic. Perform the derived-to-base 830 // search just one more time to compute all of the possible paths so 831 // that we can print them out. This is more expensive than any of 832 // the previous derived-to-base checks we've done, but at this point 833 // performance isn't as much of an issue. 834 Paths.clear(); 835 Paths.setRecordingPaths(true); 836 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 837 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 838 (void)StillOkay; 839 840 // Build up a textual representation of the ambiguous paths, e.g., 841 // D -> B -> A, that will be used to illustrate the ambiguous 842 // conversions in the diagnostic. We only print one of the paths 843 // to each base class subobject. 844 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 845 846 Diag(Loc, AmbigiousBaseConvID) 847 << Derived << Base << PathDisplayStr << Range << Name; 848 return true; 849} 850 851bool 852Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 853 SourceLocation Loc, SourceRange Range, 854 CXXCastPath *BasePath, 855 bool IgnoreAccess) { 856 return CheckDerivedToBaseConversion(Derived, Base, 857 IgnoreAccess ? 0 858 : diag::err_upcast_to_inaccessible_base, 859 diag::err_ambiguous_derived_to_base_conv, 860 Loc, Range, DeclarationName(), 861 BasePath); 862} 863 864 865/// @brief Builds a string representing ambiguous paths from a 866/// specific derived class to different subobjects of the same base 867/// class. 868/// 869/// This function builds a string that can be used in error messages 870/// to show the different paths that one can take through the 871/// inheritance hierarchy to go from the derived class to different 872/// subobjects of a base class. The result looks something like this: 873/// @code 874/// struct D -> struct B -> struct A 875/// struct D -> struct C -> struct A 876/// @endcode 877std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 878 std::string PathDisplayStr; 879 std::set<unsigned> DisplayedPaths; 880 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 881 Path != Paths.end(); ++Path) { 882 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 883 // We haven't displayed a path to this particular base 884 // class subobject yet. 885 PathDisplayStr += "\n "; 886 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 887 for (CXXBasePath::const_iterator Element = Path->begin(); 888 Element != Path->end(); ++Element) 889 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 890 } 891 } 892 893 return PathDisplayStr; 894} 895 896//===----------------------------------------------------------------------===// 897// C++ class member Handling 898//===----------------------------------------------------------------------===// 899 900/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 901Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 902 SourceLocation ASLoc, 903 SourceLocation ColonLoc) { 904 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 905 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 906 ASLoc, ColonLoc); 907 CurContext->addHiddenDecl(ASDecl); 908 return ASDecl; 909} 910 911/// CheckOverrideControl - Check C++0x override control semantics. 912void Sema::CheckOverrideControl(const Decl *D) { 913 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 914 if (!MD || !MD->isVirtual()) 915 return; 916 917 if (MD->isDependentContext()) 918 return; 919 920 // C++0x [class.virtual]p3: 921 // If a virtual function is marked with the virt-specifier override and does 922 // not override a member function of a base class, 923 // the program is ill-formed. 924 bool HasOverriddenMethods = 925 MD->begin_overridden_methods() != MD->end_overridden_methods(); 926 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 927 Diag(MD->getLocation(), 928 diag::err_function_marked_override_not_overriding) 929 << MD->getDeclName(); 930 return; 931 } 932} 933 934/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 935/// function overrides a virtual member function marked 'final', according to 936/// C++0x [class.virtual]p3. 937bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 938 const CXXMethodDecl *Old) { 939 if (!Old->hasAttr<FinalAttr>()) 940 return false; 941 942 Diag(New->getLocation(), diag::err_final_function_overridden) 943 << New->getDeclName(); 944 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 945 return true; 946} 947 948/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 949/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 950/// bitfield width if there is one and 'InitExpr' specifies the initializer if 951/// any. 952Decl * 953Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 954 MultiTemplateParamsArg TemplateParameterLists, 955 ExprTy *BW, const VirtSpecifiers &VS, 956 ExprTy *InitExpr, bool IsDefinition, 957 bool Deleted) { 958 const DeclSpec &DS = D.getDeclSpec(); 959 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 960 DeclarationName Name = NameInfo.getName(); 961 SourceLocation Loc = NameInfo.getLoc(); 962 963 // For anonymous bitfields, the location should point to the type. 964 if (Loc.isInvalid()) 965 Loc = D.getSourceRange().getBegin(); 966 967 Expr *BitWidth = static_cast<Expr*>(BW); 968 Expr *Init = static_cast<Expr*>(InitExpr); 969 970 assert(isa<CXXRecordDecl>(CurContext)); 971 assert(!DS.isFriendSpecified()); 972 973 bool isFunc = false; 974 if (D.isFunctionDeclarator()) 975 isFunc = true; 976 else if (D.getNumTypeObjects() == 0 && 977 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 978 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 979 isFunc = TDType->isFunctionType(); 980 } 981 982 // C++ 9.2p6: A member shall not be declared to have automatic storage 983 // duration (auto, register) or with the extern storage-class-specifier. 984 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 985 // data members and cannot be applied to names declared const or static, 986 // and cannot be applied to reference members. 987 switch (DS.getStorageClassSpec()) { 988 case DeclSpec::SCS_unspecified: 989 case DeclSpec::SCS_typedef: 990 case DeclSpec::SCS_static: 991 // FALL THROUGH. 992 break; 993 case DeclSpec::SCS_mutable: 994 if (isFunc) { 995 if (DS.getStorageClassSpecLoc().isValid()) 996 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 997 else 998 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 999 1000 // FIXME: It would be nicer if the keyword was ignored only for this 1001 // declarator. Otherwise we could get follow-up errors. 1002 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1003 } 1004 break; 1005 default: 1006 if (DS.getStorageClassSpecLoc().isValid()) 1007 Diag(DS.getStorageClassSpecLoc(), 1008 diag::err_storageclass_invalid_for_member); 1009 else 1010 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1011 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1012 } 1013 1014 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1015 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1016 !isFunc); 1017 1018 Decl *Member; 1019 if (isInstField) { 1020 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1021 1022 1023 if (SS.isSet() && !SS.isInvalid()) { 1024 // The user provided a superfluous scope specifier inside a class 1025 // definition: 1026 // 1027 // class X { 1028 // int X::member; 1029 // }; 1030 DeclContext *DC = 0; 1031 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1032 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1033 << Name << FixItHint::CreateRemoval(SS.getRange()); 1034 else 1035 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1036 << Name << SS.getRange(); 1037 1038 SS.clear(); 1039 } 1040 1041 // FIXME: Check for template parameters! 1042 // FIXME: Check that the name is an identifier! 1043 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1044 AS); 1045 assert(Member && "HandleField never returns null"); 1046 } else { 1047 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1048 if (!Member) { 1049 return 0; 1050 } 1051 1052 // Non-instance-fields can't have a bitfield. 1053 if (BitWidth) { 1054 if (Member->isInvalidDecl()) { 1055 // don't emit another diagnostic. 1056 } else if (isa<VarDecl>(Member)) { 1057 // C++ 9.6p3: A bit-field shall not be a static member. 1058 // "static member 'A' cannot be a bit-field" 1059 Diag(Loc, diag::err_static_not_bitfield) 1060 << Name << BitWidth->getSourceRange(); 1061 } else if (isa<TypedefDecl>(Member)) { 1062 // "typedef member 'x' cannot be a bit-field" 1063 Diag(Loc, diag::err_typedef_not_bitfield) 1064 << Name << BitWidth->getSourceRange(); 1065 } else { 1066 // A function typedef ("typedef int f(); f a;"). 1067 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1068 Diag(Loc, diag::err_not_integral_type_bitfield) 1069 << Name << cast<ValueDecl>(Member)->getType() 1070 << BitWidth->getSourceRange(); 1071 } 1072 1073 BitWidth = 0; 1074 Member->setInvalidDecl(); 1075 } 1076 1077 Member->setAccess(AS); 1078 1079 // If we have declared a member function template, set the access of the 1080 // templated declaration as well. 1081 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1082 FunTmpl->getTemplatedDecl()->setAccess(AS); 1083 } 1084 1085 if (VS.isOverrideSpecified()) { 1086 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1087 if (!MD || !MD->isVirtual()) { 1088 Diag(Member->getLocStart(), 1089 diag::override_keyword_only_allowed_on_virtual_member_functions) 1090 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1091 } else 1092 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1093 } 1094 if (VS.isFinalSpecified()) { 1095 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1096 if (!MD || !MD->isVirtual()) { 1097 Diag(Member->getLocStart(), 1098 diag::override_keyword_only_allowed_on_virtual_member_functions) 1099 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1100 } else 1101 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1102 } 1103 1104 if (VS.getLastLocation().isValid()) { 1105 // Update the end location of a method that has a virt-specifiers. 1106 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1107 MD->setRangeEnd(VS.getLastLocation()); 1108 } 1109 1110 CheckOverrideControl(Member); 1111 1112 assert((Name || isInstField) && "No identifier for non-field ?"); 1113 1114 if (Init) 1115 AddInitializerToDecl(Member, Init, false, 1116 DS.getTypeSpecType() == DeclSpec::TST_auto); 1117 if (Deleted) // FIXME: Source location is not very good. 1118 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1119 1120 FinalizeDeclaration(Member); 1121 1122 if (isInstField) 1123 FieldCollector->Add(cast<FieldDecl>(Member)); 1124 return Member; 1125} 1126 1127/// \brief Find the direct and/or virtual base specifiers that 1128/// correspond to the given base type, for use in base initialization 1129/// within a constructor. 1130static bool FindBaseInitializer(Sema &SemaRef, 1131 CXXRecordDecl *ClassDecl, 1132 QualType BaseType, 1133 const CXXBaseSpecifier *&DirectBaseSpec, 1134 const CXXBaseSpecifier *&VirtualBaseSpec) { 1135 // First, check for a direct base class. 1136 DirectBaseSpec = 0; 1137 for (CXXRecordDecl::base_class_const_iterator Base 1138 = ClassDecl->bases_begin(); 1139 Base != ClassDecl->bases_end(); ++Base) { 1140 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1141 // We found a direct base of this type. That's what we're 1142 // initializing. 1143 DirectBaseSpec = &*Base; 1144 break; 1145 } 1146 } 1147 1148 // Check for a virtual base class. 1149 // FIXME: We might be able to short-circuit this if we know in advance that 1150 // there are no virtual bases. 1151 VirtualBaseSpec = 0; 1152 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1153 // We haven't found a base yet; search the class hierarchy for a 1154 // virtual base class. 1155 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1156 /*DetectVirtual=*/false); 1157 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1158 BaseType, Paths)) { 1159 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1160 Path != Paths.end(); ++Path) { 1161 if (Path->back().Base->isVirtual()) { 1162 VirtualBaseSpec = Path->back().Base; 1163 break; 1164 } 1165 } 1166 } 1167 } 1168 1169 return DirectBaseSpec || VirtualBaseSpec; 1170} 1171 1172/// ActOnMemInitializer - Handle a C++ member initializer. 1173MemInitResult 1174Sema::ActOnMemInitializer(Decl *ConstructorD, 1175 Scope *S, 1176 CXXScopeSpec &SS, 1177 IdentifierInfo *MemberOrBase, 1178 ParsedType TemplateTypeTy, 1179 SourceLocation IdLoc, 1180 SourceLocation LParenLoc, 1181 ExprTy **Args, unsigned NumArgs, 1182 SourceLocation RParenLoc, 1183 SourceLocation EllipsisLoc) { 1184 if (!ConstructorD) 1185 return true; 1186 1187 AdjustDeclIfTemplate(ConstructorD); 1188 1189 CXXConstructorDecl *Constructor 1190 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1191 if (!Constructor) { 1192 // The user wrote a constructor initializer on a function that is 1193 // not a C++ constructor. Ignore the error for now, because we may 1194 // have more member initializers coming; we'll diagnose it just 1195 // once in ActOnMemInitializers. 1196 return true; 1197 } 1198 1199 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1200 1201 // C++ [class.base.init]p2: 1202 // Names in a mem-initializer-id are looked up in the scope of the 1203 // constructor's class and, if not found in that scope, are looked 1204 // up in the scope containing the constructor's definition. 1205 // [Note: if the constructor's class contains a member with the 1206 // same name as a direct or virtual base class of the class, a 1207 // mem-initializer-id naming the member or base class and composed 1208 // of a single identifier refers to the class member. A 1209 // mem-initializer-id for the hidden base class may be specified 1210 // using a qualified name. ] 1211 if (!SS.getScopeRep() && !TemplateTypeTy) { 1212 // Look for a member, first. 1213 FieldDecl *Member = 0; 1214 DeclContext::lookup_result Result 1215 = ClassDecl->lookup(MemberOrBase); 1216 if (Result.first != Result.second) { 1217 Member = dyn_cast<FieldDecl>(*Result.first); 1218 1219 if (Member) { 1220 if (EllipsisLoc.isValid()) 1221 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1222 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1223 1224 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1225 LParenLoc, RParenLoc); 1226 } 1227 1228 // Handle anonymous union case. 1229 if (IndirectFieldDecl* IndirectField 1230 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1231 if (EllipsisLoc.isValid()) 1232 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1233 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1234 1235 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1236 NumArgs, IdLoc, 1237 LParenLoc, RParenLoc); 1238 } 1239 } 1240 } 1241 // It didn't name a member, so see if it names a class. 1242 QualType BaseType; 1243 TypeSourceInfo *TInfo = 0; 1244 1245 if (TemplateTypeTy) { 1246 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1247 } else { 1248 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1249 LookupParsedName(R, S, &SS); 1250 1251 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1252 if (!TyD) { 1253 if (R.isAmbiguous()) return true; 1254 1255 // We don't want access-control diagnostics here. 1256 R.suppressDiagnostics(); 1257 1258 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1259 bool NotUnknownSpecialization = false; 1260 DeclContext *DC = computeDeclContext(SS, false); 1261 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1262 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1263 1264 if (!NotUnknownSpecialization) { 1265 // When the scope specifier can refer to a member of an unknown 1266 // specialization, we take it as a type name. 1267 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1268 SS.getWithLocInContext(Context), 1269 *MemberOrBase, IdLoc); 1270 if (BaseType.isNull()) 1271 return true; 1272 1273 R.clear(); 1274 R.setLookupName(MemberOrBase); 1275 } 1276 } 1277 1278 // If no results were found, try to correct typos. 1279 if (R.empty() && BaseType.isNull() && 1280 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1281 R.isSingleResult()) { 1282 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1283 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1284 // We have found a non-static data member with a similar 1285 // name to what was typed; complain and initialize that 1286 // member. 1287 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1288 << MemberOrBase << true << R.getLookupName() 1289 << FixItHint::CreateReplacement(R.getNameLoc(), 1290 R.getLookupName().getAsString()); 1291 Diag(Member->getLocation(), diag::note_previous_decl) 1292 << Member->getDeclName(); 1293 1294 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1295 LParenLoc, RParenLoc); 1296 } 1297 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1298 const CXXBaseSpecifier *DirectBaseSpec; 1299 const CXXBaseSpecifier *VirtualBaseSpec; 1300 if (FindBaseInitializer(*this, ClassDecl, 1301 Context.getTypeDeclType(Type), 1302 DirectBaseSpec, VirtualBaseSpec)) { 1303 // We have found a direct or virtual base class with a 1304 // similar name to what was typed; complain and initialize 1305 // that base class. 1306 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1307 << MemberOrBase << false << R.getLookupName() 1308 << FixItHint::CreateReplacement(R.getNameLoc(), 1309 R.getLookupName().getAsString()); 1310 1311 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1312 : VirtualBaseSpec; 1313 Diag(BaseSpec->getSourceRange().getBegin(), 1314 diag::note_base_class_specified_here) 1315 << BaseSpec->getType() 1316 << BaseSpec->getSourceRange(); 1317 1318 TyD = Type; 1319 } 1320 } 1321 } 1322 1323 if (!TyD && BaseType.isNull()) { 1324 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1325 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1326 return true; 1327 } 1328 } 1329 1330 if (BaseType.isNull()) { 1331 BaseType = Context.getTypeDeclType(TyD); 1332 if (SS.isSet()) { 1333 NestedNameSpecifier *Qualifier = 1334 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1335 1336 // FIXME: preserve source range information 1337 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1338 } 1339 } 1340 } 1341 1342 if (!TInfo) 1343 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1344 1345 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1346 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1347} 1348 1349/// Checks an initializer expression for use of uninitialized fields, such as 1350/// containing the field that is being initialized. Returns true if there is an 1351/// uninitialized field was used an updates the SourceLocation parameter; false 1352/// otherwise. 1353static bool InitExprContainsUninitializedFields(const Stmt *S, 1354 const ValueDecl *LhsField, 1355 SourceLocation *L) { 1356 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1357 1358 if (isa<CallExpr>(S)) { 1359 // Do not descend into function calls or constructors, as the use 1360 // of an uninitialized field may be valid. One would have to inspect 1361 // the contents of the function/ctor to determine if it is safe or not. 1362 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1363 // may be safe, depending on what the function/ctor does. 1364 return false; 1365 } 1366 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1367 const NamedDecl *RhsField = ME->getMemberDecl(); 1368 1369 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1370 // The member expression points to a static data member. 1371 assert(VD->isStaticDataMember() && 1372 "Member points to non-static data member!"); 1373 (void)VD; 1374 return false; 1375 } 1376 1377 if (isa<EnumConstantDecl>(RhsField)) { 1378 // The member expression points to an enum. 1379 return false; 1380 } 1381 1382 if (RhsField == LhsField) { 1383 // Initializing a field with itself. Throw a warning. 1384 // But wait; there are exceptions! 1385 // Exception #1: The field may not belong to this record. 1386 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1387 const Expr *base = ME->getBase(); 1388 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1389 // Even though the field matches, it does not belong to this record. 1390 return false; 1391 } 1392 // None of the exceptions triggered; return true to indicate an 1393 // uninitialized field was used. 1394 *L = ME->getMemberLoc(); 1395 return true; 1396 } 1397 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1398 // sizeof/alignof doesn't reference contents, do not warn. 1399 return false; 1400 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1401 // address-of doesn't reference contents (the pointer may be dereferenced 1402 // in the same expression but it would be rare; and weird). 1403 if (UOE->getOpcode() == UO_AddrOf) 1404 return false; 1405 } 1406 for (Stmt::const_child_range it = S->children(); it; ++it) { 1407 if (!*it) { 1408 // An expression such as 'member(arg ?: "")' may trigger this. 1409 continue; 1410 } 1411 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1412 return true; 1413 } 1414 return false; 1415} 1416 1417MemInitResult 1418Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1419 unsigned NumArgs, SourceLocation IdLoc, 1420 SourceLocation LParenLoc, 1421 SourceLocation RParenLoc) { 1422 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1423 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1424 assert((DirectMember || IndirectMember) && 1425 "Member must be a FieldDecl or IndirectFieldDecl"); 1426 1427 if (Member->isInvalidDecl()) 1428 return true; 1429 1430 // Diagnose value-uses of fields to initialize themselves, e.g. 1431 // foo(foo) 1432 // where foo is not also a parameter to the constructor. 1433 // TODO: implement -Wuninitialized and fold this into that framework. 1434 for (unsigned i = 0; i < NumArgs; ++i) { 1435 SourceLocation L; 1436 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1437 // FIXME: Return true in the case when other fields are used before being 1438 // uninitialized. For example, let this field be the i'th field. When 1439 // initializing the i'th field, throw a warning if any of the >= i'th 1440 // fields are used, as they are not yet initialized. 1441 // Right now we are only handling the case where the i'th field uses 1442 // itself in its initializer. 1443 Diag(L, diag::warn_field_is_uninit); 1444 } 1445 } 1446 1447 bool HasDependentArg = false; 1448 for (unsigned i = 0; i < NumArgs; i++) 1449 HasDependentArg |= Args[i]->isTypeDependent(); 1450 1451 Expr *Init; 1452 if (Member->getType()->isDependentType() || HasDependentArg) { 1453 // Can't check initialization for a member of dependent type or when 1454 // any of the arguments are type-dependent expressions. 1455 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1456 RParenLoc); 1457 1458 // Erase any temporaries within this evaluation context; we're not 1459 // going to track them in the AST, since we'll be rebuilding the 1460 // ASTs during template instantiation. 1461 ExprTemporaries.erase( 1462 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1463 ExprTemporaries.end()); 1464 } else { 1465 // Initialize the member. 1466 InitializedEntity MemberEntity = 1467 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1468 : InitializedEntity::InitializeMember(IndirectMember, 0); 1469 InitializationKind Kind = 1470 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1471 1472 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1473 1474 ExprResult MemberInit = 1475 InitSeq.Perform(*this, MemberEntity, Kind, 1476 MultiExprArg(*this, Args, NumArgs), 0); 1477 if (MemberInit.isInvalid()) 1478 return true; 1479 1480 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1481 1482 // C++0x [class.base.init]p7: 1483 // The initialization of each base and member constitutes a 1484 // full-expression. 1485 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1486 if (MemberInit.isInvalid()) 1487 return true; 1488 1489 // If we are in a dependent context, template instantiation will 1490 // perform this type-checking again. Just save the arguments that we 1491 // received in a ParenListExpr. 1492 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1493 // of the information that we have about the member 1494 // initializer. However, deconstructing the ASTs is a dicey process, 1495 // and this approach is far more likely to get the corner cases right. 1496 if (CurContext->isDependentContext()) 1497 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1498 RParenLoc); 1499 else 1500 Init = MemberInit.get(); 1501 } 1502 1503 if (DirectMember) { 1504 return new (Context) CXXCtorInitializer(Context, DirectMember, 1505 IdLoc, LParenLoc, Init, 1506 RParenLoc); 1507 } else { 1508 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1509 IdLoc, LParenLoc, Init, 1510 RParenLoc); 1511 } 1512} 1513 1514MemInitResult 1515Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1516 Expr **Args, unsigned NumArgs, 1517 SourceLocation NameLoc, 1518 SourceLocation LParenLoc, 1519 SourceLocation RParenLoc, 1520 CXXRecordDecl *ClassDecl) { 1521 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1522 if (!LangOpts.CPlusPlus0x) 1523 return Diag(Loc, diag::err_delegation_0x_only) 1524 << TInfo->getTypeLoc().getLocalSourceRange(); 1525 1526 // Initialize the object. 1527 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1528 QualType(ClassDecl->getTypeForDecl(), 0)); 1529 InitializationKind Kind = 1530 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1531 1532 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1533 1534 ExprResult DelegationInit = 1535 InitSeq.Perform(*this, DelegationEntity, Kind, 1536 MultiExprArg(*this, Args, NumArgs), 0); 1537 if (DelegationInit.isInvalid()) 1538 return true; 1539 1540 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1541 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1542 assert(Constructor && "Delegating constructor with no target?"); 1543 1544 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1545 1546 // C++0x [class.base.init]p7: 1547 // The initialization of each base and member constitutes a 1548 // full-expression. 1549 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1550 if (DelegationInit.isInvalid()) 1551 return true; 1552 1553 // If we are in a dependent context, template instantiation will 1554 // perform this type-checking again. Just save the arguments that we 1555 // received in a ParenListExpr. 1556 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1557 // of the information that we have about the base 1558 // initializer. However, deconstructing the ASTs is a dicey process, 1559 // and this approach is far more likely to get the corner cases right. 1560 if (CurContext->isDependentContext()) { 1561 ExprResult Init 1562 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1563 NumArgs, RParenLoc)); 1564 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1565 Constructor, Init.takeAs<Expr>(), 1566 RParenLoc); 1567 } 1568 1569 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1570 DelegationInit.takeAs<Expr>(), 1571 RParenLoc); 1572} 1573 1574MemInitResult 1575Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1576 Expr **Args, unsigned NumArgs, 1577 SourceLocation LParenLoc, SourceLocation RParenLoc, 1578 CXXRecordDecl *ClassDecl, 1579 SourceLocation EllipsisLoc) { 1580 bool HasDependentArg = false; 1581 for (unsigned i = 0; i < NumArgs; i++) 1582 HasDependentArg |= Args[i]->isTypeDependent(); 1583 1584 SourceLocation BaseLoc 1585 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1586 1587 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1588 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1589 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1590 1591 // C++ [class.base.init]p2: 1592 // [...] Unless the mem-initializer-id names a nonstatic data 1593 // member of the constructor's class or a direct or virtual base 1594 // of that class, the mem-initializer is ill-formed. A 1595 // mem-initializer-list can initialize a base class using any 1596 // name that denotes that base class type. 1597 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1598 1599 if (EllipsisLoc.isValid()) { 1600 // This is a pack expansion. 1601 if (!BaseType->containsUnexpandedParameterPack()) { 1602 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1603 << SourceRange(BaseLoc, RParenLoc); 1604 1605 EllipsisLoc = SourceLocation(); 1606 } 1607 } else { 1608 // Check for any unexpanded parameter packs. 1609 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1610 return true; 1611 1612 for (unsigned I = 0; I != NumArgs; ++I) 1613 if (DiagnoseUnexpandedParameterPack(Args[I])) 1614 return true; 1615 } 1616 1617 // Check for direct and virtual base classes. 1618 const CXXBaseSpecifier *DirectBaseSpec = 0; 1619 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1620 if (!Dependent) { 1621 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1622 BaseType)) 1623 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1624 LParenLoc, RParenLoc, ClassDecl); 1625 1626 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1627 VirtualBaseSpec); 1628 1629 // C++ [base.class.init]p2: 1630 // Unless the mem-initializer-id names a nonstatic data member of the 1631 // constructor's class or a direct or virtual base of that class, the 1632 // mem-initializer is ill-formed. 1633 if (!DirectBaseSpec && !VirtualBaseSpec) { 1634 // If the class has any dependent bases, then it's possible that 1635 // one of those types will resolve to the same type as 1636 // BaseType. Therefore, just treat this as a dependent base 1637 // class initialization. FIXME: Should we try to check the 1638 // initialization anyway? It seems odd. 1639 if (ClassDecl->hasAnyDependentBases()) 1640 Dependent = true; 1641 else 1642 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1643 << BaseType << Context.getTypeDeclType(ClassDecl) 1644 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1645 } 1646 } 1647 1648 if (Dependent) { 1649 // Can't check initialization for a base of dependent type or when 1650 // any of the arguments are type-dependent expressions. 1651 ExprResult BaseInit 1652 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1653 RParenLoc)); 1654 1655 // Erase any temporaries within this evaluation context; we're not 1656 // going to track them in the AST, since we'll be rebuilding the 1657 // ASTs during template instantiation. 1658 ExprTemporaries.erase( 1659 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1660 ExprTemporaries.end()); 1661 1662 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1663 /*IsVirtual=*/false, 1664 LParenLoc, 1665 BaseInit.takeAs<Expr>(), 1666 RParenLoc, 1667 EllipsisLoc); 1668 } 1669 1670 // C++ [base.class.init]p2: 1671 // If a mem-initializer-id is ambiguous because it designates both 1672 // a direct non-virtual base class and an inherited virtual base 1673 // class, the mem-initializer is ill-formed. 1674 if (DirectBaseSpec && VirtualBaseSpec) 1675 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1676 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1677 1678 CXXBaseSpecifier *BaseSpec 1679 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1680 if (!BaseSpec) 1681 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1682 1683 // Initialize the base. 1684 InitializedEntity BaseEntity = 1685 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1686 InitializationKind Kind = 1687 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1688 1689 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1690 1691 ExprResult BaseInit = 1692 InitSeq.Perform(*this, BaseEntity, Kind, 1693 MultiExprArg(*this, Args, NumArgs), 0); 1694 if (BaseInit.isInvalid()) 1695 return true; 1696 1697 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1698 1699 // C++0x [class.base.init]p7: 1700 // The initialization of each base and member constitutes a 1701 // full-expression. 1702 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1703 if (BaseInit.isInvalid()) 1704 return true; 1705 1706 // If we are in a dependent context, template instantiation will 1707 // perform this type-checking again. Just save the arguments that we 1708 // received in a ParenListExpr. 1709 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1710 // of the information that we have about the base 1711 // initializer. However, deconstructing the ASTs is a dicey process, 1712 // and this approach is far more likely to get the corner cases right. 1713 if (CurContext->isDependentContext()) { 1714 ExprResult Init 1715 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1716 RParenLoc)); 1717 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1718 BaseSpec->isVirtual(), 1719 LParenLoc, 1720 Init.takeAs<Expr>(), 1721 RParenLoc, 1722 EllipsisLoc); 1723 } 1724 1725 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1726 BaseSpec->isVirtual(), 1727 LParenLoc, 1728 BaseInit.takeAs<Expr>(), 1729 RParenLoc, 1730 EllipsisLoc); 1731} 1732 1733/// ImplicitInitializerKind - How an implicit base or member initializer should 1734/// initialize its base or member. 1735enum ImplicitInitializerKind { 1736 IIK_Default, 1737 IIK_Copy, 1738 IIK_Move 1739}; 1740 1741static bool 1742BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1743 ImplicitInitializerKind ImplicitInitKind, 1744 CXXBaseSpecifier *BaseSpec, 1745 bool IsInheritedVirtualBase, 1746 CXXCtorInitializer *&CXXBaseInit) { 1747 InitializedEntity InitEntity 1748 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1749 IsInheritedVirtualBase); 1750 1751 ExprResult BaseInit; 1752 1753 switch (ImplicitInitKind) { 1754 case IIK_Default: { 1755 InitializationKind InitKind 1756 = InitializationKind::CreateDefault(Constructor->getLocation()); 1757 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1758 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1759 MultiExprArg(SemaRef, 0, 0)); 1760 break; 1761 } 1762 1763 case IIK_Copy: { 1764 ParmVarDecl *Param = Constructor->getParamDecl(0); 1765 QualType ParamType = Param->getType().getNonReferenceType(); 1766 1767 Expr *CopyCtorArg = 1768 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1769 Constructor->getLocation(), ParamType, 1770 VK_LValue, 0); 1771 1772 // Cast to the base class to avoid ambiguities. 1773 QualType ArgTy = 1774 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1775 ParamType.getQualifiers()); 1776 1777 CXXCastPath BasePath; 1778 BasePath.push_back(BaseSpec); 1779 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1780 CK_UncheckedDerivedToBase, 1781 VK_LValue, &BasePath).take(); 1782 1783 InitializationKind InitKind 1784 = InitializationKind::CreateDirect(Constructor->getLocation(), 1785 SourceLocation(), SourceLocation()); 1786 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1787 &CopyCtorArg, 1); 1788 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1789 MultiExprArg(&CopyCtorArg, 1)); 1790 break; 1791 } 1792 1793 case IIK_Move: 1794 assert(false && "Unhandled initializer kind!"); 1795 } 1796 1797 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1798 if (BaseInit.isInvalid()) 1799 return true; 1800 1801 CXXBaseInit = 1802 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1803 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1804 SourceLocation()), 1805 BaseSpec->isVirtual(), 1806 SourceLocation(), 1807 BaseInit.takeAs<Expr>(), 1808 SourceLocation(), 1809 SourceLocation()); 1810 1811 return false; 1812} 1813 1814static bool 1815BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1816 ImplicitInitializerKind ImplicitInitKind, 1817 FieldDecl *Field, 1818 CXXCtorInitializer *&CXXMemberInit) { 1819 if (Field->isInvalidDecl()) 1820 return true; 1821 1822 SourceLocation Loc = Constructor->getLocation(); 1823 1824 if (ImplicitInitKind == IIK_Copy) { 1825 ParmVarDecl *Param = Constructor->getParamDecl(0); 1826 QualType ParamType = Param->getType().getNonReferenceType(); 1827 1828 Expr *MemberExprBase = 1829 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1830 Loc, ParamType, VK_LValue, 0); 1831 1832 // Build a reference to this field within the parameter. 1833 CXXScopeSpec SS; 1834 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1835 Sema::LookupMemberName); 1836 MemberLookup.addDecl(Field, AS_public); 1837 MemberLookup.resolveKind(); 1838 ExprResult CopyCtorArg 1839 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1840 ParamType, Loc, 1841 /*IsArrow=*/false, 1842 SS, 1843 /*FirstQualifierInScope=*/0, 1844 MemberLookup, 1845 /*TemplateArgs=*/0); 1846 if (CopyCtorArg.isInvalid()) 1847 return true; 1848 1849 // When the field we are copying is an array, create index variables for 1850 // each dimension of the array. We use these index variables to subscript 1851 // the source array, and other clients (e.g., CodeGen) will perform the 1852 // necessary iteration with these index variables. 1853 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1854 QualType BaseType = Field->getType(); 1855 QualType SizeType = SemaRef.Context.getSizeType(); 1856 while (const ConstantArrayType *Array 1857 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1858 // Create the iteration variable for this array index. 1859 IdentifierInfo *IterationVarName = 0; 1860 { 1861 llvm::SmallString<8> Str; 1862 llvm::raw_svector_ostream OS(Str); 1863 OS << "__i" << IndexVariables.size(); 1864 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1865 } 1866 VarDecl *IterationVar 1867 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1868 IterationVarName, SizeType, 1869 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1870 SC_None, SC_None); 1871 IndexVariables.push_back(IterationVar); 1872 1873 // Create a reference to the iteration variable. 1874 ExprResult IterationVarRef 1875 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1876 assert(!IterationVarRef.isInvalid() && 1877 "Reference to invented variable cannot fail!"); 1878 1879 // Subscript the array with this iteration variable. 1880 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1881 Loc, 1882 IterationVarRef.take(), 1883 Loc); 1884 if (CopyCtorArg.isInvalid()) 1885 return true; 1886 1887 BaseType = Array->getElementType(); 1888 } 1889 1890 // Construct the entity that we will be initializing. For an array, this 1891 // will be first element in the array, which may require several levels 1892 // of array-subscript entities. 1893 llvm::SmallVector<InitializedEntity, 4> Entities; 1894 Entities.reserve(1 + IndexVariables.size()); 1895 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1896 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1897 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1898 0, 1899 Entities.back())); 1900 1901 // Direct-initialize to use the copy constructor. 1902 InitializationKind InitKind = 1903 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1904 1905 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1906 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1907 &CopyCtorArgE, 1); 1908 1909 ExprResult MemberInit 1910 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1911 MultiExprArg(&CopyCtorArgE, 1)); 1912 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1913 if (MemberInit.isInvalid()) 1914 return true; 1915 1916 CXXMemberInit 1917 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1918 MemberInit.takeAs<Expr>(), Loc, 1919 IndexVariables.data(), 1920 IndexVariables.size()); 1921 return false; 1922 } 1923 1924 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1925 1926 QualType FieldBaseElementType = 1927 SemaRef.Context.getBaseElementType(Field->getType()); 1928 1929 if (FieldBaseElementType->isRecordType()) { 1930 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1931 InitializationKind InitKind = 1932 InitializationKind::CreateDefault(Loc); 1933 1934 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1935 ExprResult MemberInit = 1936 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1937 1938 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1939 if (MemberInit.isInvalid()) 1940 return true; 1941 1942 CXXMemberInit = 1943 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1944 Field, Loc, Loc, 1945 MemberInit.get(), 1946 Loc); 1947 return false; 1948 } 1949 1950 if (FieldBaseElementType->isReferenceType()) { 1951 SemaRef.Diag(Constructor->getLocation(), 1952 diag::err_uninitialized_member_in_ctor) 1953 << (int)Constructor->isImplicit() 1954 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1955 << 0 << Field->getDeclName(); 1956 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1957 return true; 1958 } 1959 1960 if (FieldBaseElementType.isConstQualified()) { 1961 SemaRef.Diag(Constructor->getLocation(), 1962 diag::err_uninitialized_member_in_ctor) 1963 << (int)Constructor->isImplicit() 1964 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1965 << 1 << Field->getDeclName(); 1966 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1967 return true; 1968 } 1969 1970 // Nothing to initialize. 1971 CXXMemberInit = 0; 1972 return false; 1973} 1974 1975namespace { 1976struct BaseAndFieldInfo { 1977 Sema &S; 1978 CXXConstructorDecl *Ctor; 1979 bool AnyErrorsInInits; 1980 ImplicitInitializerKind IIK; 1981 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1982 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1983 1984 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1985 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1986 // FIXME: Handle implicit move constructors. 1987 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1988 IIK = IIK_Copy; 1989 else 1990 IIK = IIK_Default; 1991 } 1992}; 1993} 1994 1995static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1996 FieldDecl *Top, FieldDecl *Field) { 1997 1998 // Overwhelmingly common case: we have a direct initializer for this field. 1999 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2000 Info.AllToInit.push_back(Init); 2001 return false; 2002 } 2003 2004 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2005 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2006 assert(FieldClassType && "anonymous struct/union without record type"); 2007 CXXRecordDecl *FieldClassDecl 2008 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2009 2010 // Even though union members never have non-trivial default 2011 // constructions in C++03, we still build member initializers for aggregate 2012 // record types which can be union members, and C++0x allows non-trivial 2013 // default constructors for union members, so we ensure that only one 2014 // member is initialized for these. 2015 if (FieldClassDecl->isUnion()) { 2016 // First check for an explicit initializer for one field. 2017 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2018 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2019 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2020 Info.AllToInit.push_back(Init); 2021 2022 // Once we've initialized a field of an anonymous union, the union 2023 // field in the class is also initialized, so exit immediately. 2024 return false; 2025 } else if ((*FA)->isAnonymousStructOrUnion()) { 2026 if (CollectFieldInitializer(Info, Top, *FA)) 2027 return true; 2028 } 2029 } 2030 2031 // Fallthrough and construct a default initializer for the union as 2032 // a whole, which can call its default constructor if such a thing exists 2033 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2034 // behavior going forward with C++0x, when anonymous unions there are 2035 // finalized, we should revisit this. 2036 } else { 2037 // For structs, we simply descend through to initialize all members where 2038 // necessary. 2039 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2040 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2041 if (CollectFieldInitializer(Info, Top, *FA)) 2042 return true; 2043 } 2044 } 2045 } 2046 2047 // Don't try to build an implicit initializer if there were semantic 2048 // errors in any of the initializers (and therefore we might be 2049 // missing some that the user actually wrote). 2050 if (Info.AnyErrorsInInits) 2051 return false; 2052 2053 CXXCtorInitializer *Init = 0; 2054 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2055 return true; 2056 2057 if (Init) 2058 Info.AllToInit.push_back(Init); 2059 2060 return false; 2061} 2062 2063bool 2064Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2065 CXXCtorInitializer **Initializers, 2066 unsigned NumInitializers, 2067 bool AnyErrors) { 2068 if (Constructor->getDeclContext()->isDependentContext()) { 2069 // Just store the initializers as written, they will be checked during 2070 // instantiation. 2071 if (NumInitializers > 0) { 2072 Constructor->setNumCtorInitializers(NumInitializers); 2073 CXXCtorInitializer **baseOrMemberInitializers = 2074 new (Context) CXXCtorInitializer*[NumInitializers]; 2075 memcpy(baseOrMemberInitializers, Initializers, 2076 NumInitializers * sizeof(CXXCtorInitializer*)); 2077 Constructor->setCtorInitializers(baseOrMemberInitializers); 2078 } 2079 2080 return false; 2081 } 2082 2083 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2084 2085 // We need to build the initializer AST according to order of construction 2086 // and not what user specified in the Initializers list. 2087 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2088 if (!ClassDecl) 2089 return true; 2090 2091 bool HadError = false; 2092 2093 for (unsigned i = 0; i < NumInitializers; i++) { 2094 CXXCtorInitializer *Member = Initializers[i]; 2095 2096 if (Member->isBaseInitializer()) 2097 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2098 else 2099 Info.AllBaseFields[Member->getAnyMember()] = Member; 2100 } 2101 2102 // Keep track of the direct virtual bases. 2103 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2104 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2105 E = ClassDecl->bases_end(); I != E; ++I) { 2106 if (I->isVirtual()) 2107 DirectVBases.insert(I); 2108 } 2109 2110 // Push virtual bases before others. 2111 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2112 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2113 2114 if (CXXCtorInitializer *Value 2115 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2116 Info.AllToInit.push_back(Value); 2117 } else if (!AnyErrors) { 2118 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2119 CXXCtorInitializer *CXXBaseInit; 2120 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2121 VBase, IsInheritedVirtualBase, 2122 CXXBaseInit)) { 2123 HadError = true; 2124 continue; 2125 } 2126 2127 Info.AllToInit.push_back(CXXBaseInit); 2128 } 2129 } 2130 2131 // Non-virtual bases. 2132 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2133 E = ClassDecl->bases_end(); Base != E; ++Base) { 2134 // Virtuals are in the virtual base list and already constructed. 2135 if (Base->isVirtual()) 2136 continue; 2137 2138 if (CXXCtorInitializer *Value 2139 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2140 Info.AllToInit.push_back(Value); 2141 } else if (!AnyErrors) { 2142 CXXCtorInitializer *CXXBaseInit; 2143 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2144 Base, /*IsInheritedVirtualBase=*/false, 2145 CXXBaseInit)) { 2146 HadError = true; 2147 continue; 2148 } 2149 2150 Info.AllToInit.push_back(CXXBaseInit); 2151 } 2152 } 2153 2154 // Fields. 2155 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2156 E = ClassDecl->field_end(); Field != E; ++Field) { 2157 if ((*Field)->getType()->isIncompleteArrayType()) { 2158 assert(ClassDecl->hasFlexibleArrayMember() && 2159 "Incomplete array type is not valid"); 2160 continue; 2161 } 2162 if (CollectFieldInitializer(Info, *Field, *Field)) 2163 HadError = true; 2164 } 2165 2166 NumInitializers = Info.AllToInit.size(); 2167 if (NumInitializers > 0) { 2168 Constructor->setNumCtorInitializers(NumInitializers); 2169 CXXCtorInitializer **baseOrMemberInitializers = 2170 new (Context) CXXCtorInitializer*[NumInitializers]; 2171 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2172 NumInitializers * sizeof(CXXCtorInitializer*)); 2173 Constructor->setCtorInitializers(baseOrMemberInitializers); 2174 2175 // Constructors implicitly reference the base and member 2176 // destructors. 2177 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2178 Constructor->getParent()); 2179 } 2180 2181 return HadError; 2182} 2183 2184static void *GetKeyForTopLevelField(FieldDecl *Field) { 2185 // For anonymous unions, use the class declaration as the key. 2186 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2187 if (RT->getDecl()->isAnonymousStructOrUnion()) 2188 return static_cast<void *>(RT->getDecl()); 2189 } 2190 return static_cast<void *>(Field); 2191} 2192 2193static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2194 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2195} 2196 2197static void *GetKeyForMember(ASTContext &Context, 2198 CXXCtorInitializer *Member) { 2199 if (!Member->isAnyMemberInitializer()) 2200 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2201 2202 // For fields injected into the class via declaration of an anonymous union, 2203 // use its anonymous union class declaration as the unique key. 2204 FieldDecl *Field = Member->getAnyMember(); 2205 2206 // If the field is a member of an anonymous struct or union, our key 2207 // is the anonymous record decl that's a direct child of the class. 2208 RecordDecl *RD = Field->getParent(); 2209 if (RD->isAnonymousStructOrUnion()) { 2210 while (true) { 2211 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2212 if (Parent->isAnonymousStructOrUnion()) 2213 RD = Parent; 2214 else 2215 break; 2216 } 2217 2218 return static_cast<void *>(RD); 2219 } 2220 2221 return static_cast<void *>(Field); 2222} 2223 2224static void 2225DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2226 const CXXConstructorDecl *Constructor, 2227 CXXCtorInitializer **Inits, 2228 unsigned NumInits) { 2229 if (Constructor->getDeclContext()->isDependentContext()) 2230 return; 2231 2232 // Don't check initializers order unless the warning is enabled at the 2233 // location of at least one initializer. 2234 bool ShouldCheckOrder = false; 2235 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2236 CXXCtorInitializer *Init = Inits[InitIndex]; 2237 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2238 Init->getSourceLocation()) 2239 != Diagnostic::Ignored) { 2240 ShouldCheckOrder = true; 2241 break; 2242 } 2243 } 2244 if (!ShouldCheckOrder) 2245 return; 2246 2247 // Build the list of bases and members in the order that they'll 2248 // actually be initialized. The explicit initializers should be in 2249 // this same order but may be missing things. 2250 llvm::SmallVector<const void*, 32> IdealInitKeys; 2251 2252 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2253 2254 // 1. Virtual bases. 2255 for (CXXRecordDecl::base_class_const_iterator VBase = 2256 ClassDecl->vbases_begin(), 2257 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2258 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2259 2260 // 2. Non-virtual bases. 2261 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2262 E = ClassDecl->bases_end(); Base != E; ++Base) { 2263 if (Base->isVirtual()) 2264 continue; 2265 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2266 } 2267 2268 // 3. Direct fields. 2269 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2270 E = ClassDecl->field_end(); Field != E; ++Field) 2271 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2272 2273 unsigned NumIdealInits = IdealInitKeys.size(); 2274 unsigned IdealIndex = 0; 2275 2276 CXXCtorInitializer *PrevInit = 0; 2277 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2278 CXXCtorInitializer *Init = Inits[InitIndex]; 2279 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2280 2281 // Scan forward to try to find this initializer in the idealized 2282 // initializers list. 2283 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2284 if (InitKey == IdealInitKeys[IdealIndex]) 2285 break; 2286 2287 // If we didn't find this initializer, it must be because we 2288 // scanned past it on a previous iteration. That can only 2289 // happen if we're out of order; emit a warning. 2290 if (IdealIndex == NumIdealInits && PrevInit) { 2291 Sema::SemaDiagnosticBuilder D = 2292 SemaRef.Diag(PrevInit->getSourceLocation(), 2293 diag::warn_initializer_out_of_order); 2294 2295 if (PrevInit->isAnyMemberInitializer()) 2296 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2297 else 2298 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2299 2300 if (Init->isAnyMemberInitializer()) 2301 D << 0 << Init->getAnyMember()->getDeclName(); 2302 else 2303 D << 1 << Init->getBaseClassInfo()->getType(); 2304 2305 // Move back to the initializer's location in the ideal list. 2306 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2307 if (InitKey == IdealInitKeys[IdealIndex]) 2308 break; 2309 2310 assert(IdealIndex != NumIdealInits && 2311 "initializer not found in initializer list"); 2312 } 2313 2314 PrevInit = Init; 2315 } 2316} 2317 2318namespace { 2319bool CheckRedundantInit(Sema &S, 2320 CXXCtorInitializer *Init, 2321 CXXCtorInitializer *&PrevInit) { 2322 if (!PrevInit) { 2323 PrevInit = Init; 2324 return false; 2325 } 2326 2327 if (FieldDecl *Field = Init->getMember()) 2328 S.Diag(Init->getSourceLocation(), 2329 diag::err_multiple_mem_initialization) 2330 << Field->getDeclName() 2331 << Init->getSourceRange(); 2332 else { 2333 const Type *BaseClass = Init->getBaseClass(); 2334 assert(BaseClass && "neither field nor base"); 2335 S.Diag(Init->getSourceLocation(), 2336 diag::err_multiple_base_initialization) 2337 << QualType(BaseClass, 0) 2338 << Init->getSourceRange(); 2339 } 2340 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2341 << 0 << PrevInit->getSourceRange(); 2342 2343 return true; 2344} 2345 2346typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2347typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2348 2349bool CheckRedundantUnionInit(Sema &S, 2350 CXXCtorInitializer *Init, 2351 RedundantUnionMap &Unions) { 2352 FieldDecl *Field = Init->getAnyMember(); 2353 RecordDecl *Parent = Field->getParent(); 2354 if (!Parent->isAnonymousStructOrUnion()) 2355 return false; 2356 2357 NamedDecl *Child = Field; 2358 do { 2359 if (Parent->isUnion()) { 2360 UnionEntry &En = Unions[Parent]; 2361 if (En.first && En.first != Child) { 2362 S.Diag(Init->getSourceLocation(), 2363 diag::err_multiple_mem_union_initialization) 2364 << Field->getDeclName() 2365 << Init->getSourceRange(); 2366 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2367 << 0 << En.second->getSourceRange(); 2368 return true; 2369 } else if (!En.first) { 2370 En.first = Child; 2371 En.second = Init; 2372 } 2373 } 2374 2375 Child = Parent; 2376 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2377 } while (Parent->isAnonymousStructOrUnion()); 2378 2379 return false; 2380} 2381} 2382 2383/// ActOnMemInitializers - Handle the member initializers for a constructor. 2384void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2385 SourceLocation ColonLoc, 2386 MemInitTy **meminits, unsigned NumMemInits, 2387 bool AnyErrors) { 2388 if (!ConstructorDecl) 2389 return; 2390 2391 AdjustDeclIfTemplate(ConstructorDecl); 2392 2393 CXXConstructorDecl *Constructor 2394 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2395 2396 if (!Constructor) { 2397 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2398 return; 2399 } 2400 2401 CXXCtorInitializer **MemInits = 2402 reinterpret_cast<CXXCtorInitializer **>(meminits); 2403 2404 // Mapping for the duplicate initializers check. 2405 // For member initializers, this is keyed with a FieldDecl*. 2406 // For base initializers, this is keyed with a Type*. 2407 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2408 2409 // Mapping for the inconsistent anonymous-union initializers check. 2410 RedundantUnionMap MemberUnions; 2411 2412 bool HadError = false; 2413 for (unsigned i = 0; i < NumMemInits; i++) { 2414 CXXCtorInitializer *Init = MemInits[i]; 2415 2416 // Set the source order index. 2417 Init->setSourceOrder(i); 2418 2419 if (Init->isAnyMemberInitializer()) { 2420 FieldDecl *Field = Init->getAnyMember(); 2421 if (CheckRedundantInit(*this, Init, Members[Field]) || 2422 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2423 HadError = true; 2424 } else if (Init->isBaseInitializer()) { 2425 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2426 if (CheckRedundantInit(*this, Init, Members[Key])) 2427 HadError = true; 2428 } else { 2429 assert(Init->isDelegatingInitializer()); 2430 // This must be the only initializer 2431 if (i != 0 || NumMemInits > 1) { 2432 Diag(MemInits[0]->getSourceLocation(), 2433 diag::err_delegating_initializer_alone) 2434 << MemInits[0]->getSourceRange(); 2435 HadError = true; 2436 } 2437 } 2438 } 2439 2440 if (HadError) 2441 return; 2442 2443 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2444 2445 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2446} 2447 2448void 2449Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2450 CXXRecordDecl *ClassDecl) { 2451 // Ignore dependent contexts. 2452 if (ClassDecl->isDependentContext()) 2453 return; 2454 2455 // FIXME: all the access-control diagnostics are positioned on the 2456 // field/base declaration. That's probably good; that said, the 2457 // user might reasonably want to know why the destructor is being 2458 // emitted, and we currently don't say. 2459 2460 // Non-static data members. 2461 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2462 E = ClassDecl->field_end(); I != E; ++I) { 2463 FieldDecl *Field = *I; 2464 if (Field->isInvalidDecl()) 2465 continue; 2466 QualType FieldType = Context.getBaseElementType(Field->getType()); 2467 2468 const RecordType* RT = FieldType->getAs<RecordType>(); 2469 if (!RT) 2470 continue; 2471 2472 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2473 if (FieldClassDecl->isInvalidDecl()) 2474 continue; 2475 if (FieldClassDecl->hasTrivialDestructor()) 2476 continue; 2477 2478 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2479 assert(Dtor && "No dtor found for FieldClassDecl!"); 2480 CheckDestructorAccess(Field->getLocation(), Dtor, 2481 PDiag(diag::err_access_dtor_field) 2482 << Field->getDeclName() 2483 << FieldType); 2484 2485 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2486 } 2487 2488 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2489 2490 // Bases. 2491 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2492 E = ClassDecl->bases_end(); Base != E; ++Base) { 2493 // Bases are always records in a well-formed non-dependent class. 2494 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2495 2496 // Remember direct virtual bases. 2497 if (Base->isVirtual()) 2498 DirectVirtualBases.insert(RT); 2499 2500 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2501 // If our base class is invalid, we probably can't get its dtor anyway. 2502 if (BaseClassDecl->isInvalidDecl()) 2503 continue; 2504 // Ignore trivial destructors. 2505 if (BaseClassDecl->hasTrivialDestructor()) 2506 continue; 2507 2508 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2509 assert(Dtor && "No dtor found for BaseClassDecl!"); 2510 2511 // FIXME: caret should be on the start of the class name 2512 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2513 PDiag(diag::err_access_dtor_base) 2514 << Base->getType() 2515 << Base->getSourceRange()); 2516 2517 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2518 } 2519 2520 // Virtual bases. 2521 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2522 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2523 2524 // Bases are always records in a well-formed non-dependent class. 2525 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2526 2527 // Ignore direct virtual bases. 2528 if (DirectVirtualBases.count(RT)) 2529 continue; 2530 2531 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2532 // If our base class is invalid, we probably can't get its dtor anyway. 2533 if (BaseClassDecl->isInvalidDecl()) 2534 continue; 2535 // Ignore trivial destructors. 2536 if (BaseClassDecl->hasTrivialDestructor()) 2537 continue; 2538 2539 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2540 assert(Dtor && "No dtor found for BaseClassDecl!"); 2541 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2542 PDiag(diag::err_access_dtor_vbase) 2543 << VBase->getType()); 2544 2545 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2546 } 2547} 2548 2549void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2550 if (!CDtorDecl) 2551 return; 2552 2553 if (CXXConstructorDecl *Constructor 2554 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2555 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2556} 2557 2558bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2559 unsigned DiagID, AbstractDiagSelID SelID) { 2560 if (SelID == -1) 2561 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2562 else 2563 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2564} 2565 2566bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2567 const PartialDiagnostic &PD) { 2568 if (!getLangOptions().CPlusPlus) 2569 return false; 2570 2571 if (const ArrayType *AT = Context.getAsArrayType(T)) 2572 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2573 2574 if (const PointerType *PT = T->getAs<PointerType>()) { 2575 // Find the innermost pointer type. 2576 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2577 PT = T; 2578 2579 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2580 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2581 } 2582 2583 const RecordType *RT = T->getAs<RecordType>(); 2584 if (!RT) 2585 return false; 2586 2587 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2588 2589 // We can't answer whether something is abstract until it has a 2590 // definition. If it's currently being defined, we'll walk back 2591 // over all the declarations when we have a full definition. 2592 const CXXRecordDecl *Def = RD->getDefinition(); 2593 if (!Def || Def->isBeingDefined()) 2594 return false; 2595 2596 if (!RD->isAbstract()) 2597 return false; 2598 2599 Diag(Loc, PD) << RD->getDeclName(); 2600 DiagnoseAbstractType(RD); 2601 2602 return true; 2603} 2604 2605void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2606 // Check if we've already emitted the list of pure virtual functions 2607 // for this class. 2608 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2609 return; 2610 2611 CXXFinalOverriderMap FinalOverriders; 2612 RD->getFinalOverriders(FinalOverriders); 2613 2614 // Keep a set of seen pure methods so we won't diagnose the same method 2615 // more than once. 2616 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2617 2618 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2619 MEnd = FinalOverriders.end(); 2620 M != MEnd; 2621 ++M) { 2622 for (OverridingMethods::iterator SO = M->second.begin(), 2623 SOEnd = M->second.end(); 2624 SO != SOEnd; ++SO) { 2625 // C++ [class.abstract]p4: 2626 // A class is abstract if it contains or inherits at least one 2627 // pure virtual function for which the final overrider is pure 2628 // virtual. 2629 2630 // 2631 if (SO->second.size() != 1) 2632 continue; 2633 2634 if (!SO->second.front().Method->isPure()) 2635 continue; 2636 2637 if (!SeenPureMethods.insert(SO->second.front().Method)) 2638 continue; 2639 2640 Diag(SO->second.front().Method->getLocation(), 2641 diag::note_pure_virtual_function) 2642 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2643 } 2644 } 2645 2646 if (!PureVirtualClassDiagSet) 2647 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2648 PureVirtualClassDiagSet->insert(RD); 2649} 2650 2651namespace { 2652struct AbstractUsageInfo { 2653 Sema &S; 2654 CXXRecordDecl *Record; 2655 CanQualType AbstractType; 2656 bool Invalid; 2657 2658 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2659 : S(S), Record(Record), 2660 AbstractType(S.Context.getCanonicalType( 2661 S.Context.getTypeDeclType(Record))), 2662 Invalid(false) {} 2663 2664 void DiagnoseAbstractType() { 2665 if (Invalid) return; 2666 S.DiagnoseAbstractType(Record); 2667 Invalid = true; 2668 } 2669 2670 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2671}; 2672 2673struct CheckAbstractUsage { 2674 AbstractUsageInfo &Info; 2675 const NamedDecl *Ctx; 2676 2677 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2678 : Info(Info), Ctx(Ctx) {} 2679 2680 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2681 switch (TL.getTypeLocClass()) { 2682#define ABSTRACT_TYPELOC(CLASS, PARENT) 2683#define TYPELOC(CLASS, PARENT) \ 2684 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2685#include "clang/AST/TypeLocNodes.def" 2686 } 2687 } 2688 2689 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2690 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2691 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2692 if (!TL.getArg(I)) 2693 continue; 2694 2695 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2696 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2697 } 2698 } 2699 2700 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2701 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2702 } 2703 2704 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2705 // Visit the type parameters from a permissive context. 2706 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2707 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2708 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2709 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2710 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2711 // TODO: other template argument types? 2712 } 2713 } 2714 2715 // Visit pointee types from a permissive context. 2716#define CheckPolymorphic(Type) \ 2717 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2718 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2719 } 2720 CheckPolymorphic(PointerTypeLoc) 2721 CheckPolymorphic(ReferenceTypeLoc) 2722 CheckPolymorphic(MemberPointerTypeLoc) 2723 CheckPolymorphic(BlockPointerTypeLoc) 2724 2725 /// Handle all the types we haven't given a more specific 2726 /// implementation for above. 2727 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2728 // Every other kind of type that we haven't called out already 2729 // that has an inner type is either (1) sugar or (2) contains that 2730 // inner type in some way as a subobject. 2731 if (TypeLoc Next = TL.getNextTypeLoc()) 2732 return Visit(Next, Sel); 2733 2734 // If there's no inner type and we're in a permissive context, 2735 // don't diagnose. 2736 if (Sel == Sema::AbstractNone) return; 2737 2738 // Check whether the type matches the abstract type. 2739 QualType T = TL.getType(); 2740 if (T->isArrayType()) { 2741 Sel = Sema::AbstractArrayType; 2742 T = Info.S.Context.getBaseElementType(T); 2743 } 2744 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2745 if (CT != Info.AbstractType) return; 2746 2747 // It matched; do some magic. 2748 if (Sel == Sema::AbstractArrayType) { 2749 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2750 << T << TL.getSourceRange(); 2751 } else { 2752 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2753 << Sel << T << TL.getSourceRange(); 2754 } 2755 Info.DiagnoseAbstractType(); 2756 } 2757}; 2758 2759void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2760 Sema::AbstractDiagSelID Sel) { 2761 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2762} 2763 2764} 2765 2766/// Check for invalid uses of an abstract type in a method declaration. 2767static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2768 CXXMethodDecl *MD) { 2769 // No need to do the check on definitions, which require that 2770 // the return/param types be complete. 2771 if (MD->isThisDeclarationADefinition()) 2772 return; 2773 2774 // For safety's sake, just ignore it if we don't have type source 2775 // information. This should never happen for non-implicit methods, 2776 // but... 2777 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2778 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2779} 2780 2781/// Check for invalid uses of an abstract type within a class definition. 2782static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2783 CXXRecordDecl *RD) { 2784 for (CXXRecordDecl::decl_iterator 2785 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2786 Decl *D = *I; 2787 if (D->isImplicit()) continue; 2788 2789 // Methods and method templates. 2790 if (isa<CXXMethodDecl>(D)) { 2791 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2792 } else if (isa<FunctionTemplateDecl>(D)) { 2793 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2794 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2795 2796 // Fields and static variables. 2797 } else if (isa<FieldDecl>(D)) { 2798 FieldDecl *FD = cast<FieldDecl>(D); 2799 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2800 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2801 } else if (isa<VarDecl>(D)) { 2802 VarDecl *VD = cast<VarDecl>(D); 2803 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2804 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2805 2806 // Nested classes and class templates. 2807 } else if (isa<CXXRecordDecl>(D)) { 2808 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2809 } else if (isa<ClassTemplateDecl>(D)) { 2810 CheckAbstractClassUsage(Info, 2811 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2812 } 2813 } 2814} 2815 2816/// \brief Perform semantic checks on a class definition that has been 2817/// completing, introducing implicitly-declared members, checking for 2818/// abstract types, etc. 2819void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2820 if (!Record) 2821 return; 2822 2823 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2824 AbstractUsageInfo Info(*this, Record); 2825 CheckAbstractClassUsage(Info, Record); 2826 } 2827 2828 // If this is not an aggregate type and has no user-declared constructor, 2829 // complain about any non-static data members of reference or const scalar 2830 // type, since they will never get initializers. 2831 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2832 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2833 bool Complained = false; 2834 for (RecordDecl::field_iterator F = Record->field_begin(), 2835 FEnd = Record->field_end(); 2836 F != FEnd; ++F) { 2837 if (F->getType()->isReferenceType() || 2838 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2839 if (!Complained) { 2840 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2841 << Record->getTagKind() << Record; 2842 Complained = true; 2843 } 2844 2845 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2846 << F->getType()->isReferenceType() 2847 << F->getDeclName(); 2848 } 2849 } 2850 } 2851 2852 if (Record->isDynamicClass() && !Record->isDependentType()) 2853 DynamicClasses.push_back(Record); 2854 2855 if (Record->getIdentifier()) { 2856 // C++ [class.mem]p13: 2857 // If T is the name of a class, then each of the following shall have a 2858 // name different from T: 2859 // - every member of every anonymous union that is a member of class T. 2860 // 2861 // C++ [class.mem]p14: 2862 // In addition, if class T has a user-declared constructor (12.1), every 2863 // non-static data member of class T shall have a name different from T. 2864 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2865 R.first != R.second; ++R.first) { 2866 NamedDecl *D = *R.first; 2867 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2868 isa<IndirectFieldDecl>(D)) { 2869 Diag(D->getLocation(), diag::err_member_name_of_class) 2870 << D->getDeclName(); 2871 break; 2872 } 2873 } 2874 } 2875 2876 // Warn if the class has virtual methods but non-virtual public destructor. 2877 if (Record->isPolymorphic() && !Record->isDependentType()) { 2878 CXXDestructorDecl *dtor = Record->getDestructor(); 2879 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2880 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2881 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2882 } 2883 2884 // See if a method overloads virtual methods in a base 2885 /// class without overriding any. 2886 if (!Record->isDependentType()) { 2887 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2888 MEnd = Record->method_end(); 2889 M != MEnd; ++M) { 2890 if (!(*M)->isStatic()) 2891 DiagnoseHiddenVirtualMethods(Record, *M); 2892 } 2893 } 2894 2895 // Declare inherited constructors. We do this eagerly here because: 2896 // - The standard requires an eager diagnostic for conflicting inherited 2897 // constructors from different classes. 2898 // - The lazy declaration of the other implicit constructors is so as to not 2899 // waste space and performance on classes that are not meant to be 2900 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2901 // have inherited constructors. 2902 DeclareInheritedConstructors(Record); 2903} 2904 2905/// \brief Data used with FindHiddenVirtualMethod 2906namespace { 2907 struct FindHiddenVirtualMethodData { 2908 Sema *S; 2909 CXXMethodDecl *Method; 2910 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2911 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2912 }; 2913} 2914 2915/// \brief Member lookup function that determines whether a given C++ 2916/// method overloads virtual methods in a base class without overriding any, 2917/// to be used with CXXRecordDecl::lookupInBases(). 2918static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2919 CXXBasePath &Path, 2920 void *UserData) { 2921 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2922 2923 FindHiddenVirtualMethodData &Data 2924 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2925 2926 DeclarationName Name = Data.Method->getDeclName(); 2927 assert(Name.getNameKind() == DeclarationName::Identifier); 2928 2929 bool foundSameNameMethod = false; 2930 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2931 for (Path.Decls = BaseRecord->lookup(Name); 2932 Path.Decls.first != Path.Decls.second; 2933 ++Path.Decls.first) { 2934 NamedDecl *D = *Path.Decls.first; 2935 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2936 MD = MD->getCanonicalDecl(); 2937 foundSameNameMethod = true; 2938 // Interested only in hidden virtual methods. 2939 if (!MD->isVirtual()) 2940 continue; 2941 // If the method we are checking overrides a method from its base 2942 // don't warn about the other overloaded methods. 2943 if (!Data.S->IsOverload(Data.Method, MD, false)) 2944 return true; 2945 // Collect the overload only if its hidden. 2946 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2947 overloadedMethods.push_back(MD); 2948 } 2949 } 2950 2951 if (foundSameNameMethod) 2952 Data.OverloadedMethods.append(overloadedMethods.begin(), 2953 overloadedMethods.end()); 2954 return foundSameNameMethod; 2955} 2956 2957/// \brief See if a method overloads virtual methods in a base class without 2958/// overriding any. 2959void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2960 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2961 MD->getLocation()) == Diagnostic::Ignored) 2962 return; 2963 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2964 return; 2965 2966 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2967 /*bool RecordPaths=*/false, 2968 /*bool DetectVirtual=*/false); 2969 FindHiddenVirtualMethodData Data; 2970 Data.Method = MD; 2971 Data.S = this; 2972 2973 // Keep the base methods that were overriden or introduced in the subclass 2974 // by 'using' in a set. A base method not in this set is hidden. 2975 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2976 res.first != res.second; ++res.first) { 2977 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2978 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2979 E = MD->end_overridden_methods(); 2980 I != E; ++I) 2981 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2982 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2983 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2984 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2985 } 2986 2987 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2988 !Data.OverloadedMethods.empty()) { 2989 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2990 << MD << (Data.OverloadedMethods.size() > 1); 2991 2992 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2993 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2994 Diag(overloadedMD->getLocation(), 2995 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2996 } 2997 } 2998} 2999 3000void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3001 Decl *TagDecl, 3002 SourceLocation LBrac, 3003 SourceLocation RBrac, 3004 AttributeList *AttrList) { 3005 if (!TagDecl) 3006 return; 3007 3008 AdjustDeclIfTemplate(TagDecl); 3009 3010 ActOnFields(S, RLoc, TagDecl, 3011 // strict aliasing violation! 3012 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3013 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3014 3015 CheckCompletedCXXClass( 3016 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3017} 3018 3019namespace { 3020 /// \brief Helper class that collects exception specifications for 3021 /// implicitly-declared special member functions. 3022 class ImplicitExceptionSpecification { 3023 ASTContext &Context; 3024 // We order exception specifications thus: 3025 // noexcept is the most restrictive, but is only used in C++0x. 3026 // throw() comes next. 3027 // Then a throw(collected exceptions) 3028 // Finally no specification. 3029 // throw(...) is used instead if any called function uses it. 3030 ExceptionSpecificationType ComputedEST; 3031 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3032 llvm::SmallVector<QualType, 4> Exceptions; 3033 3034 void ClearExceptions() { 3035 ExceptionsSeen.clear(); 3036 Exceptions.clear(); 3037 } 3038 3039 public: 3040 explicit ImplicitExceptionSpecification(ASTContext &Context) 3041 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3042 if (!Context.getLangOptions().CPlusPlus0x) 3043 ComputedEST = EST_DynamicNone; 3044 } 3045 3046 /// \brief Get the computed exception specification type. 3047 ExceptionSpecificationType getExceptionSpecType() const { 3048 assert(ComputedEST != EST_ComputedNoexcept && 3049 "noexcept(expr) should not be a possible result"); 3050 return ComputedEST; 3051 } 3052 3053 /// \brief The number of exceptions in the exception specification. 3054 unsigned size() const { return Exceptions.size(); } 3055 3056 /// \brief The set of exceptions in the exception specification. 3057 const QualType *data() const { return Exceptions.data(); } 3058 3059 /// \brief Integrate another called method into the collected data. 3060 void CalledDecl(CXXMethodDecl *Method) { 3061 // If we have an MSAny spec already, don't bother. 3062 if (!Method || ComputedEST == EST_MSAny) 3063 return; 3064 3065 const FunctionProtoType *Proto 3066 = Method->getType()->getAs<FunctionProtoType>(); 3067 3068 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3069 3070 // If this function can throw any exceptions, make a note of that. 3071 if (EST == EST_MSAny || EST == EST_None) { 3072 ClearExceptions(); 3073 ComputedEST = EST; 3074 return; 3075 } 3076 3077 // If this function has a basic noexcept, it doesn't affect the outcome. 3078 if (EST == EST_BasicNoexcept) 3079 return; 3080 3081 // If we have a throw-all spec at this point, ignore the function. 3082 if (ComputedEST == EST_None) 3083 return; 3084 3085 // If we're still at noexcept(true) and there's a nothrow() callee, 3086 // change to that specification. 3087 if (EST == EST_DynamicNone) { 3088 if (ComputedEST == EST_BasicNoexcept) 3089 ComputedEST = EST_DynamicNone; 3090 return; 3091 } 3092 3093 // Check out noexcept specs. 3094 if (EST == EST_ComputedNoexcept) { 3095 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3096 assert(NR != FunctionProtoType::NR_NoNoexcept && 3097 "Must have noexcept result for EST_ComputedNoexcept."); 3098 assert(NR != FunctionProtoType::NR_Dependent && 3099 "Should not generate implicit declarations for dependent cases, " 3100 "and don't know how to handle them anyway."); 3101 3102 // noexcept(false) -> no spec on the new function 3103 if (NR == FunctionProtoType::NR_Throw) { 3104 ClearExceptions(); 3105 ComputedEST = EST_None; 3106 } 3107 // noexcept(true) won't change anything either. 3108 return; 3109 } 3110 3111 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3112 assert(ComputedEST != EST_None && 3113 "Shouldn't collect exceptions when throw-all is guaranteed."); 3114 ComputedEST = EST_Dynamic; 3115 // Record the exceptions in this function's exception specification. 3116 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3117 EEnd = Proto->exception_end(); 3118 E != EEnd; ++E) 3119 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3120 Exceptions.push_back(*E); 3121 } 3122 }; 3123} 3124 3125 3126/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3127/// special functions, such as the default constructor, copy 3128/// constructor, or destructor, to the given C++ class (C++ 3129/// [special]p1). This routine can only be executed just before the 3130/// definition of the class is complete. 3131void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3132 if (!ClassDecl->hasUserDeclaredConstructor()) 3133 ++ASTContext::NumImplicitDefaultConstructors; 3134 3135 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3136 ++ASTContext::NumImplicitCopyConstructors; 3137 3138 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3139 ++ASTContext::NumImplicitCopyAssignmentOperators; 3140 3141 // If we have a dynamic class, then the copy assignment operator may be 3142 // virtual, so we have to declare it immediately. This ensures that, e.g., 3143 // it shows up in the right place in the vtable and that we diagnose 3144 // problems with the implicit exception specification. 3145 if (ClassDecl->isDynamicClass()) 3146 DeclareImplicitCopyAssignment(ClassDecl); 3147 } 3148 3149 if (!ClassDecl->hasUserDeclaredDestructor()) { 3150 ++ASTContext::NumImplicitDestructors; 3151 3152 // If we have a dynamic class, then the destructor may be virtual, so we 3153 // have to declare the destructor immediately. This ensures that, e.g., it 3154 // shows up in the right place in the vtable and that we diagnose problems 3155 // with the implicit exception specification. 3156 if (ClassDecl->isDynamicClass()) 3157 DeclareImplicitDestructor(ClassDecl); 3158 } 3159} 3160 3161void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3162 if (!D) 3163 return; 3164 3165 TemplateParameterList *Params = 0; 3166 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3167 Params = Template->getTemplateParameters(); 3168 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3169 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3170 Params = PartialSpec->getTemplateParameters(); 3171 else 3172 return; 3173 3174 for (TemplateParameterList::iterator Param = Params->begin(), 3175 ParamEnd = Params->end(); 3176 Param != ParamEnd; ++Param) { 3177 NamedDecl *Named = cast<NamedDecl>(*Param); 3178 if (Named->getDeclName()) { 3179 S->AddDecl(Named); 3180 IdResolver.AddDecl(Named); 3181 } 3182 } 3183} 3184 3185void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3186 if (!RecordD) return; 3187 AdjustDeclIfTemplate(RecordD); 3188 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3189 PushDeclContext(S, Record); 3190} 3191 3192void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3193 if (!RecordD) return; 3194 PopDeclContext(); 3195} 3196 3197/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3198/// parsing a top-level (non-nested) C++ class, and we are now 3199/// parsing those parts of the given Method declaration that could 3200/// not be parsed earlier (C++ [class.mem]p2), such as default 3201/// arguments. This action should enter the scope of the given 3202/// Method declaration as if we had just parsed the qualified method 3203/// name. However, it should not bring the parameters into scope; 3204/// that will be performed by ActOnDelayedCXXMethodParameter. 3205void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3206} 3207 3208/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3209/// C++ method declaration. We're (re-)introducing the given 3210/// function parameter into scope for use in parsing later parts of 3211/// the method declaration. For example, we could see an 3212/// ActOnParamDefaultArgument event for this parameter. 3213void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3214 if (!ParamD) 3215 return; 3216 3217 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3218 3219 // If this parameter has an unparsed default argument, clear it out 3220 // to make way for the parsed default argument. 3221 if (Param->hasUnparsedDefaultArg()) 3222 Param->setDefaultArg(0); 3223 3224 S->AddDecl(Param); 3225 if (Param->getDeclName()) 3226 IdResolver.AddDecl(Param); 3227} 3228 3229/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3230/// processing the delayed method declaration for Method. The method 3231/// declaration is now considered finished. There may be a separate 3232/// ActOnStartOfFunctionDef action later (not necessarily 3233/// immediately!) for this method, if it was also defined inside the 3234/// class body. 3235void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3236 if (!MethodD) 3237 return; 3238 3239 AdjustDeclIfTemplate(MethodD); 3240 3241 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3242 3243 // Now that we have our default arguments, check the constructor 3244 // again. It could produce additional diagnostics or affect whether 3245 // the class has implicitly-declared destructors, among other 3246 // things. 3247 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3248 CheckConstructor(Constructor); 3249 3250 // Check the default arguments, which we may have added. 3251 if (!Method->isInvalidDecl()) 3252 CheckCXXDefaultArguments(Method); 3253} 3254 3255/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3256/// the well-formedness of the constructor declarator @p D with type @p 3257/// R. If there are any errors in the declarator, this routine will 3258/// emit diagnostics and set the invalid bit to true. In any case, the type 3259/// will be updated to reflect a well-formed type for the constructor and 3260/// returned. 3261QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3262 StorageClass &SC) { 3263 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3264 3265 // C++ [class.ctor]p3: 3266 // A constructor shall not be virtual (10.3) or static (9.4). A 3267 // constructor can be invoked for a const, volatile or const 3268 // volatile object. A constructor shall not be declared const, 3269 // volatile, or const volatile (9.3.2). 3270 if (isVirtual) { 3271 if (!D.isInvalidType()) 3272 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3273 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3274 << SourceRange(D.getIdentifierLoc()); 3275 D.setInvalidType(); 3276 } 3277 if (SC == SC_Static) { 3278 if (!D.isInvalidType()) 3279 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3280 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3281 << SourceRange(D.getIdentifierLoc()); 3282 D.setInvalidType(); 3283 SC = SC_None; 3284 } 3285 3286 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3287 if (FTI.TypeQuals != 0) { 3288 if (FTI.TypeQuals & Qualifiers::Const) 3289 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3290 << "const" << SourceRange(D.getIdentifierLoc()); 3291 if (FTI.TypeQuals & Qualifiers::Volatile) 3292 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3293 << "volatile" << SourceRange(D.getIdentifierLoc()); 3294 if (FTI.TypeQuals & Qualifiers::Restrict) 3295 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3296 << "restrict" << SourceRange(D.getIdentifierLoc()); 3297 D.setInvalidType(); 3298 } 3299 3300 // C++0x [class.ctor]p4: 3301 // A constructor shall not be declared with a ref-qualifier. 3302 if (FTI.hasRefQualifier()) { 3303 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3304 << FTI.RefQualifierIsLValueRef 3305 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3306 D.setInvalidType(); 3307 } 3308 3309 // Rebuild the function type "R" without any type qualifiers (in 3310 // case any of the errors above fired) and with "void" as the 3311 // return type, since constructors don't have return types. 3312 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3313 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3314 return R; 3315 3316 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3317 EPI.TypeQuals = 0; 3318 EPI.RefQualifier = RQ_None; 3319 3320 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3321 Proto->getNumArgs(), EPI); 3322} 3323 3324/// CheckConstructor - Checks a fully-formed constructor for 3325/// well-formedness, issuing any diagnostics required. Returns true if 3326/// the constructor declarator is invalid. 3327void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3328 CXXRecordDecl *ClassDecl 3329 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3330 if (!ClassDecl) 3331 return Constructor->setInvalidDecl(); 3332 3333 // C++ [class.copy]p3: 3334 // A declaration of a constructor for a class X is ill-formed if 3335 // its first parameter is of type (optionally cv-qualified) X and 3336 // either there are no other parameters or else all other 3337 // parameters have default arguments. 3338 if (!Constructor->isInvalidDecl() && 3339 ((Constructor->getNumParams() == 1) || 3340 (Constructor->getNumParams() > 1 && 3341 Constructor->getParamDecl(1)->hasDefaultArg())) && 3342 Constructor->getTemplateSpecializationKind() 3343 != TSK_ImplicitInstantiation) { 3344 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3345 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3346 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3347 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3348 const char *ConstRef 3349 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3350 : " const &"; 3351 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3352 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3353 3354 // FIXME: Rather that making the constructor invalid, we should endeavor 3355 // to fix the type. 3356 Constructor->setInvalidDecl(); 3357 } 3358 } 3359} 3360 3361/// CheckDestructor - Checks a fully-formed destructor definition for 3362/// well-formedness, issuing any diagnostics required. Returns true 3363/// on error. 3364bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3365 CXXRecordDecl *RD = Destructor->getParent(); 3366 3367 if (Destructor->isVirtual()) { 3368 SourceLocation Loc; 3369 3370 if (!Destructor->isImplicit()) 3371 Loc = Destructor->getLocation(); 3372 else 3373 Loc = RD->getLocation(); 3374 3375 // If we have a virtual destructor, look up the deallocation function 3376 FunctionDecl *OperatorDelete = 0; 3377 DeclarationName Name = 3378 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3379 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3380 return true; 3381 3382 MarkDeclarationReferenced(Loc, OperatorDelete); 3383 3384 Destructor->setOperatorDelete(OperatorDelete); 3385 } 3386 3387 return false; 3388} 3389 3390static inline bool 3391FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3392 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3393 FTI.ArgInfo[0].Param && 3394 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3395} 3396 3397/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3398/// the well-formednes of the destructor declarator @p D with type @p 3399/// R. If there are any errors in the declarator, this routine will 3400/// emit diagnostics and set the declarator to invalid. Even if this happens, 3401/// will be updated to reflect a well-formed type for the destructor and 3402/// returned. 3403QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3404 StorageClass& SC) { 3405 // C++ [class.dtor]p1: 3406 // [...] A typedef-name that names a class is a class-name 3407 // (7.1.3); however, a typedef-name that names a class shall not 3408 // be used as the identifier in the declarator for a destructor 3409 // declaration. 3410 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3411 if (isa<TypedefType>(DeclaratorType)) 3412 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3413 << DeclaratorType; 3414 3415 // C++ [class.dtor]p2: 3416 // A destructor is used to destroy objects of its class type. A 3417 // destructor takes no parameters, and no return type can be 3418 // specified for it (not even void). The address of a destructor 3419 // shall not be taken. A destructor shall not be static. A 3420 // destructor can be invoked for a const, volatile or const 3421 // volatile object. A destructor shall not be declared const, 3422 // volatile or const volatile (9.3.2). 3423 if (SC == SC_Static) { 3424 if (!D.isInvalidType()) 3425 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3426 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3427 << SourceRange(D.getIdentifierLoc()) 3428 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3429 3430 SC = SC_None; 3431 } 3432 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3433 // Destructors don't have return types, but the parser will 3434 // happily parse something like: 3435 // 3436 // class X { 3437 // float ~X(); 3438 // }; 3439 // 3440 // The return type will be eliminated later. 3441 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3442 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3443 << SourceRange(D.getIdentifierLoc()); 3444 } 3445 3446 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3447 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3448 if (FTI.TypeQuals & Qualifiers::Const) 3449 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3450 << "const" << SourceRange(D.getIdentifierLoc()); 3451 if (FTI.TypeQuals & Qualifiers::Volatile) 3452 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3453 << "volatile" << SourceRange(D.getIdentifierLoc()); 3454 if (FTI.TypeQuals & Qualifiers::Restrict) 3455 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3456 << "restrict" << SourceRange(D.getIdentifierLoc()); 3457 D.setInvalidType(); 3458 } 3459 3460 // C++0x [class.dtor]p2: 3461 // A destructor shall not be declared with a ref-qualifier. 3462 if (FTI.hasRefQualifier()) { 3463 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3464 << FTI.RefQualifierIsLValueRef 3465 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3466 D.setInvalidType(); 3467 } 3468 3469 // Make sure we don't have any parameters. 3470 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3471 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3472 3473 // Delete the parameters. 3474 FTI.freeArgs(); 3475 D.setInvalidType(); 3476 } 3477 3478 // Make sure the destructor isn't variadic. 3479 if (FTI.isVariadic) { 3480 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3481 D.setInvalidType(); 3482 } 3483 3484 // Rebuild the function type "R" without any type qualifiers or 3485 // parameters (in case any of the errors above fired) and with 3486 // "void" as the return type, since destructors don't have return 3487 // types. 3488 if (!D.isInvalidType()) 3489 return R; 3490 3491 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3492 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3493 EPI.Variadic = false; 3494 EPI.TypeQuals = 0; 3495 EPI.RefQualifier = RQ_None; 3496 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3497} 3498 3499/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3500/// well-formednes of the conversion function declarator @p D with 3501/// type @p R. If there are any errors in the declarator, this routine 3502/// will emit diagnostics and return true. Otherwise, it will return 3503/// false. Either way, the type @p R will be updated to reflect a 3504/// well-formed type for the conversion operator. 3505void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3506 StorageClass& SC) { 3507 // C++ [class.conv.fct]p1: 3508 // Neither parameter types nor return type can be specified. The 3509 // type of a conversion function (8.3.5) is "function taking no 3510 // parameter returning conversion-type-id." 3511 if (SC == SC_Static) { 3512 if (!D.isInvalidType()) 3513 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3514 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3515 << SourceRange(D.getIdentifierLoc()); 3516 D.setInvalidType(); 3517 SC = SC_None; 3518 } 3519 3520 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3521 3522 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3523 // Conversion functions don't have return types, but the parser will 3524 // happily parse something like: 3525 // 3526 // class X { 3527 // float operator bool(); 3528 // }; 3529 // 3530 // The return type will be changed later anyway. 3531 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3532 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3533 << SourceRange(D.getIdentifierLoc()); 3534 D.setInvalidType(); 3535 } 3536 3537 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3538 3539 // Make sure we don't have any parameters. 3540 if (Proto->getNumArgs() > 0) { 3541 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3542 3543 // Delete the parameters. 3544 D.getFunctionTypeInfo().freeArgs(); 3545 D.setInvalidType(); 3546 } else if (Proto->isVariadic()) { 3547 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3548 D.setInvalidType(); 3549 } 3550 3551 // Diagnose "&operator bool()" and other such nonsense. This 3552 // is actually a gcc extension which we don't support. 3553 if (Proto->getResultType() != ConvType) { 3554 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3555 << Proto->getResultType(); 3556 D.setInvalidType(); 3557 ConvType = Proto->getResultType(); 3558 } 3559 3560 // C++ [class.conv.fct]p4: 3561 // The conversion-type-id shall not represent a function type nor 3562 // an array type. 3563 if (ConvType->isArrayType()) { 3564 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3565 ConvType = Context.getPointerType(ConvType); 3566 D.setInvalidType(); 3567 } else if (ConvType->isFunctionType()) { 3568 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3569 ConvType = Context.getPointerType(ConvType); 3570 D.setInvalidType(); 3571 } 3572 3573 // Rebuild the function type "R" without any parameters (in case any 3574 // of the errors above fired) and with the conversion type as the 3575 // return type. 3576 if (D.isInvalidType()) 3577 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3578 3579 // C++0x explicit conversion operators. 3580 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3581 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3582 diag::warn_explicit_conversion_functions) 3583 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3584} 3585 3586/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3587/// the declaration of the given C++ conversion function. This routine 3588/// is responsible for recording the conversion function in the C++ 3589/// class, if possible. 3590Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3591 assert(Conversion && "Expected to receive a conversion function declaration"); 3592 3593 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3594 3595 // Make sure we aren't redeclaring the conversion function. 3596 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3597 3598 // C++ [class.conv.fct]p1: 3599 // [...] A conversion function is never used to convert a 3600 // (possibly cv-qualified) object to the (possibly cv-qualified) 3601 // same object type (or a reference to it), to a (possibly 3602 // cv-qualified) base class of that type (or a reference to it), 3603 // or to (possibly cv-qualified) void. 3604 // FIXME: Suppress this warning if the conversion function ends up being a 3605 // virtual function that overrides a virtual function in a base class. 3606 QualType ClassType 3607 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3608 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3609 ConvType = ConvTypeRef->getPointeeType(); 3610 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3611 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3612 /* Suppress diagnostics for instantiations. */; 3613 else if (ConvType->isRecordType()) { 3614 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3615 if (ConvType == ClassType) 3616 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3617 << ClassType; 3618 else if (IsDerivedFrom(ClassType, ConvType)) 3619 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3620 << ClassType << ConvType; 3621 } else if (ConvType->isVoidType()) { 3622 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3623 << ClassType << ConvType; 3624 } 3625 3626 if (FunctionTemplateDecl *ConversionTemplate 3627 = Conversion->getDescribedFunctionTemplate()) 3628 return ConversionTemplate; 3629 3630 return Conversion; 3631} 3632 3633//===----------------------------------------------------------------------===// 3634// Namespace Handling 3635//===----------------------------------------------------------------------===// 3636 3637 3638 3639/// ActOnStartNamespaceDef - This is called at the start of a namespace 3640/// definition. 3641Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3642 SourceLocation InlineLoc, 3643 SourceLocation NamespaceLoc, 3644 SourceLocation IdentLoc, 3645 IdentifierInfo *II, 3646 SourceLocation LBrace, 3647 AttributeList *AttrList) { 3648 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3649 // For anonymous namespace, take the location of the left brace. 3650 SourceLocation Loc = II ? IdentLoc : LBrace; 3651 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3652 StartLoc, Loc, II); 3653 Namespc->setInline(InlineLoc.isValid()); 3654 3655 Scope *DeclRegionScope = NamespcScope->getParent(); 3656 3657 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3658 3659 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3660 PushNamespaceVisibilityAttr(Attr); 3661 3662 if (II) { 3663 // C++ [namespace.def]p2: 3664 // The identifier in an original-namespace-definition shall not 3665 // have been previously defined in the declarative region in 3666 // which the original-namespace-definition appears. The 3667 // identifier in an original-namespace-definition is the name of 3668 // the namespace. Subsequently in that declarative region, it is 3669 // treated as an original-namespace-name. 3670 // 3671 // Since namespace names are unique in their scope, and we don't 3672 // look through using directives, just 3673 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3674 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3675 3676 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3677 // This is an extended namespace definition. 3678 if (Namespc->isInline() != OrigNS->isInline()) { 3679 // inline-ness must match 3680 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3681 << Namespc->isInline(); 3682 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3683 Namespc->setInvalidDecl(); 3684 // Recover by ignoring the new namespace's inline status. 3685 Namespc->setInline(OrigNS->isInline()); 3686 } 3687 3688 // Attach this namespace decl to the chain of extended namespace 3689 // definitions. 3690 OrigNS->setNextNamespace(Namespc); 3691 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3692 3693 // Remove the previous declaration from the scope. 3694 if (DeclRegionScope->isDeclScope(OrigNS)) { 3695 IdResolver.RemoveDecl(OrigNS); 3696 DeclRegionScope->RemoveDecl(OrigNS); 3697 } 3698 } else if (PrevDecl) { 3699 // This is an invalid name redefinition. 3700 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3701 << Namespc->getDeclName(); 3702 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3703 Namespc->setInvalidDecl(); 3704 // Continue on to push Namespc as current DeclContext and return it. 3705 } else if (II->isStr("std") && 3706 CurContext->getRedeclContext()->isTranslationUnit()) { 3707 // This is the first "real" definition of the namespace "std", so update 3708 // our cache of the "std" namespace to point at this definition. 3709 if (NamespaceDecl *StdNS = getStdNamespace()) { 3710 // We had already defined a dummy namespace "std". Link this new 3711 // namespace definition to the dummy namespace "std". 3712 StdNS->setNextNamespace(Namespc); 3713 StdNS->setLocation(IdentLoc); 3714 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3715 } 3716 3717 // Make our StdNamespace cache point at the first real definition of the 3718 // "std" namespace. 3719 StdNamespace = Namespc; 3720 } 3721 3722 PushOnScopeChains(Namespc, DeclRegionScope); 3723 } else { 3724 // Anonymous namespaces. 3725 assert(Namespc->isAnonymousNamespace()); 3726 3727 // Link the anonymous namespace into its parent. 3728 NamespaceDecl *PrevDecl; 3729 DeclContext *Parent = CurContext->getRedeclContext(); 3730 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3731 PrevDecl = TU->getAnonymousNamespace(); 3732 TU->setAnonymousNamespace(Namespc); 3733 } else { 3734 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3735 PrevDecl = ND->getAnonymousNamespace(); 3736 ND->setAnonymousNamespace(Namespc); 3737 } 3738 3739 // Link the anonymous namespace with its previous declaration. 3740 if (PrevDecl) { 3741 assert(PrevDecl->isAnonymousNamespace()); 3742 assert(!PrevDecl->getNextNamespace()); 3743 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3744 PrevDecl->setNextNamespace(Namespc); 3745 3746 if (Namespc->isInline() != PrevDecl->isInline()) { 3747 // inline-ness must match 3748 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3749 << Namespc->isInline(); 3750 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3751 Namespc->setInvalidDecl(); 3752 // Recover by ignoring the new namespace's inline status. 3753 Namespc->setInline(PrevDecl->isInline()); 3754 } 3755 } 3756 3757 CurContext->addDecl(Namespc); 3758 3759 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3760 // behaves as if it were replaced by 3761 // namespace unique { /* empty body */ } 3762 // using namespace unique; 3763 // namespace unique { namespace-body } 3764 // where all occurrences of 'unique' in a translation unit are 3765 // replaced by the same identifier and this identifier differs 3766 // from all other identifiers in the entire program. 3767 3768 // We just create the namespace with an empty name and then add an 3769 // implicit using declaration, just like the standard suggests. 3770 // 3771 // CodeGen enforces the "universally unique" aspect by giving all 3772 // declarations semantically contained within an anonymous 3773 // namespace internal linkage. 3774 3775 if (!PrevDecl) { 3776 UsingDirectiveDecl* UD 3777 = UsingDirectiveDecl::Create(Context, CurContext, 3778 /* 'using' */ LBrace, 3779 /* 'namespace' */ SourceLocation(), 3780 /* qualifier */ NestedNameSpecifierLoc(), 3781 /* identifier */ SourceLocation(), 3782 Namespc, 3783 /* Ancestor */ CurContext); 3784 UD->setImplicit(); 3785 CurContext->addDecl(UD); 3786 } 3787 } 3788 3789 // Although we could have an invalid decl (i.e. the namespace name is a 3790 // redefinition), push it as current DeclContext and try to continue parsing. 3791 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3792 // for the namespace has the declarations that showed up in that particular 3793 // namespace definition. 3794 PushDeclContext(NamespcScope, Namespc); 3795 return Namespc; 3796} 3797 3798/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3799/// is a namespace alias, returns the namespace it points to. 3800static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3801 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3802 return AD->getNamespace(); 3803 return dyn_cast_or_null<NamespaceDecl>(D); 3804} 3805 3806/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3807/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3808void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3809 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3810 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3811 Namespc->setRBraceLoc(RBrace); 3812 PopDeclContext(); 3813 if (Namespc->hasAttr<VisibilityAttr>()) 3814 PopPragmaVisibility(); 3815} 3816 3817CXXRecordDecl *Sema::getStdBadAlloc() const { 3818 return cast_or_null<CXXRecordDecl>( 3819 StdBadAlloc.get(Context.getExternalSource())); 3820} 3821 3822NamespaceDecl *Sema::getStdNamespace() const { 3823 return cast_or_null<NamespaceDecl>( 3824 StdNamespace.get(Context.getExternalSource())); 3825} 3826 3827/// \brief Retrieve the special "std" namespace, which may require us to 3828/// implicitly define the namespace. 3829NamespaceDecl *Sema::getOrCreateStdNamespace() { 3830 if (!StdNamespace) { 3831 // The "std" namespace has not yet been defined, so build one implicitly. 3832 StdNamespace = NamespaceDecl::Create(Context, 3833 Context.getTranslationUnitDecl(), 3834 SourceLocation(), SourceLocation(), 3835 &PP.getIdentifierTable().get("std")); 3836 getStdNamespace()->setImplicit(true); 3837 } 3838 3839 return getStdNamespace(); 3840} 3841 3842/// \brief Determine whether a using statement is in a context where it will be 3843/// apply in all contexts. 3844static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3845 switch (CurContext->getDeclKind()) { 3846 case Decl::TranslationUnit: 3847 return true; 3848 case Decl::LinkageSpec: 3849 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3850 default: 3851 return false; 3852 } 3853} 3854 3855Decl *Sema::ActOnUsingDirective(Scope *S, 3856 SourceLocation UsingLoc, 3857 SourceLocation NamespcLoc, 3858 CXXScopeSpec &SS, 3859 SourceLocation IdentLoc, 3860 IdentifierInfo *NamespcName, 3861 AttributeList *AttrList) { 3862 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3863 assert(NamespcName && "Invalid NamespcName."); 3864 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3865 3866 // This can only happen along a recovery path. 3867 while (S->getFlags() & Scope::TemplateParamScope) 3868 S = S->getParent(); 3869 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3870 3871 UsingDirectiveDecl *UDir = 0; 3872 NestedNameSpecifier *Qualifier = 0; 3873 if (SS.isSet()) 3874 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3875 3876 // Lookup namespace name. 3877 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3878 LookupParsedName(R, S, &SS); 3879 if (R.isAmbiguous()) 3880 return 0; 3881 3882 if (R.empty()) { 3883 // Allow "using namespace std;" or "using namespace ::std;" even if 3884 // "std" hasn't been defined yet, for GCC compatibility. 3885 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3886 NamespcName->isStr("std")) { 3887 Diag(IdentLoc, diag::ext_using_undefined_std); 3888 R.addDecl(getOrCreateStdNamespace()); 3889 R.resolveKind(); 3890 } 3891 // Otherwise, attempt typo correction. 3892 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3893 CTC_NoKeywords, 0)) { 3894 if (R.getAsSingle<NamespaceDecl>() || 3895 R.getAsSingle<NamespaceAliasDecl>()) { 3896 if (DeclContext *DC = computeDeclContext(SS, false)) 3897 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3898 << NamespcName << DC << Corrected << SS.getRange() 3899 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3900 else 3901 Diag(IdentLoc, diag::err_using_directive_suggest) 3902 << NamespcName << Corrected 3903 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3904 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3905 << Corrected; 3906 3907 NamespcName = Corrected.getAsIdentifierInfo(); 3908 } else { 3909 R.clear(); 3910 R.setLookupName(NamespcName); 3911 } 3912 } 3913 } 3914 3915 if (!R.empty()) { 3916 NamedDecl *Named = R.getFoundDecl(); 3917 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3918 && "expected namespace decl"); 3919 // C++ [namespace.udir]p1: 3920 // A using-directive specifies that the names in the nominated 3921 // namespace can be used in the scope in which the 3922 // using-directive appears after the using-directive. During 3923 // unqualified name lookup (3.4.1), the names appear as if they 3924 // were declared in the nearest enclosing namespace which 3925 // contains both the using-directive and the nominated 3926 // namespace. [Note: in this context, "contains" means "contains 3927 // directly or indirectly". ] 3928 3929 // Find enclosing context containing both using-directive and 3930 // nominated namespace. 3931 NamespaceDecl *NS = getNamespaceDecl(Named); 3932 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3933 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3934 CommonAncestor = CommonAncestor->getParent(); 3935 3936 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3937 SS.getWithLocInContext(Context), 3938 IdentLoc, Named, CommonAncestor); 3939 3940 if (IsUsingDirectiveInToplevelContext(CurContext) && 3941 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 3942 Diag(IdentLoc, diag::warn_using_directive_in_header); 3943 } 3944 3945 PushUsingDirective(S, UDir); 3946 } else { 3947 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3948 } 3949 3950 // FIXME: We ignore attributes for now. 3951 return UDir; 3952} 3953 3954void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3955 // If scope has associated entity, then using directive is at namespace 3956 // or translation unit scope. We add UsingDirectiveDecls, into 3957 // it's lookup structure. 3958 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3959 Ctx->addDecl(UDir); 3960 else 3961 // Otherwise it is block-sope. using-directives will affect lookup 3962 // only to the end of scope. 3963 S->PushUsingDirective(UDir); 3964} 3965 3966 3967Decl *Sema::ActOnUsingDeclaration(Scope *S, 3968 AccessSpecifier AS, 3969 bool HasUsingKeyword, 3970 SourceLocation UsingLoc, 3971 CXXScopeSpec &SS, 3972 UnqualifiedId &Name, 3973 AttributeList *AttrList, 3974 bool IsTypeName, 3975 SourceLocation TypenameLoc) { 3976 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3977 3978 switch (Name.getKind()) { 3979 case UnqualifiedId::IK_Identifier: 3980 case UnqualifiedId::IK_OperatorFunctionId: 3981 case UnqualifiedId::IK_LiteralOperatorId: 3982 case UnqualifiedId::IK_ConversionFunctionId: 3983 break; 3984 3985 case UnqualifiedId::IK_ConstructorName: 3986 case UnqualifiedId::IK_ConstructorTemplateId: 3987 // C++0x inherited constructors. 3988 if (getLangOptions().CPlusPlus0x) break; 3989 3990 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3991 << SS.getRange(); 3992 return 0; 3993 3994 case UnqualifiedId::IK_DestructorName: 3995 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3996 << SS.getRange(); 3997 return 0; 3998 3999 case UnqualifiedId::IK_TemplateId: 4000 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4001 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4002 return 0; 4003 } 4004 4005 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4006 DeclarationName TargetName = TargetNameInfo.getName(); 4007 if (!TargetName) 4008 return 0; 4009 4010 // Warn about using declarations. 4011 // TODO: store that the declaration was written without 'using' and 4012 // talk about access decls instead of using decls in the 4013 // diagnostics. 4014 if (!HasUsingKeyword) { 4015 UsingLoc = Name.getSourceRange().getBegin(); 4016 4017 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4018 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4019 } 4020 4021 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4022 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4023 return 0; 4024 4025 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4026 TargetNameInfo, AttrList, 4027 /* IsInstantiation */ false, 4028 IsTypeName, TypenameLoc); 4029 if (UD) 4030 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4031 4032 return UD; 4033} 4034 4035/// \brief Determine whether a using declaration considers the given 4036/// declarations as "equivalent", e.g., if they are redeclarations of 4037/// the same entity or are both typedefs of the same type. 4038static bool 4039IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4040 bool &SuppressRedeclaration) { 4041 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4042 SuppressRedeclaration = false; 4043 return true; 4044 } 4045 4046 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 4047 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 4048 SuppressRedeclaration = true; 4049 return Context.hasSameType(TD1->getUnderlyingType(), 4050 TD2->getUnderlyingType()); 4051 } 4052 4053 return false; 4054} 4055 4056 4057/// Determines whether to create a using shadow decl for a particular 4058/// decl, given the set of decls existing prior to this using lookup. 4059bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4060 const LookupResult &Previous) { 4061 // Diagnose finding a decl which is not from a base class of the 4062 // current class. We do this now because there are cases where this 4063 // function will silently decide not to build a shadow decl, which 4064 // will pre-empt further diagnostics. 4065 // 4066 // We don't need to do this in C++0x because we do the check once on 4067 // the qualifier. 4068 // 4069 // FIXME: diagnose the following if we care enough: 4070 // struct A { int foo; }; 4071 // struct B : A { using A::foo; }; 4072 // template <class T> struct C : A {}; 4073 // template <class T> struct D : C<T> { using B::foo; } // <--- 4074 // This is invalid (during instantiation) in C++03 because B::foo 4075 // resolves to the using decl in B, which is not a base class of D<T>. 4076 // We can't diagnose it immediately because C<T> is an unknown 4077 // specialization. The UsingShadowDecl in D<T> then points directly 4078 // to A::foo, which will look well-formed when we instantiate. 4079 // The right solution is to not collapse the shadow-decl chain. 4080 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4081 DeclContext *OrigDC = Orig->getDeclContext(); 4082 4083 // Handle enums and anonymous structs. 4084 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4085 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4086 while (OrigRec->isAnonymousStructOrUnion()) 4087 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4088 4089 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4090 if (OrigDC == CurContext) { 4091 Diag(Using->getLocation(), 4092 diag::err_using_decl_nested_name_specifier_is_current_class) 4093 << Using->getQualifierLoc().getSourceRange(); 4094 Diag(Orig->getLocation(), diag::note_using_decl_target); 4095 return true; 4096 } 4097 4098 Diag(Using->getQualifierLoc().getBeginLoc(), 4099 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4100 << Using->getQualifier() 4101 << cast<CXXRecordDecl>(CurContext) 4102 << Using->getQualifierLoc().getSourceRange(); 4103 Diag(Orig->getLocation(), diag::note_using_decl_target); 4104 return true; 4105 } 4106 } 4107 4108 if (Previous.empty()) return false; 4109 4110 NamedDecl *Target = Orig; 4111 if (isa<UsingShadowDecl>(Target)) 4112 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4113 4114 // If the target happens to be one of the previous declarations, we 4115 // don't have a conflict. 4116 // 4117 // FIXME: but we might be increasing its access, in which case we 4118 // should redeclare it. 4119 NamedDecl *NonTag = 0, *Tag = 0; 4120 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4121 I != E; ++I) { 4122 NamedDecl *D = (*I)->getUnderlyingDecl(); 4123 bool Result; 4124 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4125 return Result; 4126 4127 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4128 } 4129 4130 if (Target->isFunctionOrFunctionTemplate()) { 4131 FunctionDecl *FD; 4132 if (isa<FunctionTemplateDecl>(Target)) 4133 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4134 else 4135 FD = cast<FunctionDecl>(Target); 4136 4137 NamedDecl *OldDecl = 0; 4138 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4139 case Ovl_Overload: 4140 return false; 4141 4142 case Ovl_NonFunction: 4143 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4144 break; 4145 4146 // We found a decl with the exact signature. 4147 case Ovl_Match: 4148 // If we're in a record, we want to hide the target, so we 4149 // return true (without a diagnostic) to tell the caller not to 4150 // build a shadow decl. 4151 if (CurContext->isRecord()) 4152 return true; 4153 4154 // If we're not in a record, this is an error. 4155 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4156 break; 4157 } 4158 4159 Diag(Target->getLocation(), diag::note_using_decl_target); 4160 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4161 return true; 4162 } 4163 4164 // Target is not a function. 4165 4166 if (isa<TagDecl>(Target)) { 4167 // No conflict between a tag and a non-tag. 4168 if (!Tag) return false; 4169 4170 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4171 Diag(Target->getLocation(), diag::note_using_decl_target); 4172 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4173 return true; 4174 } 4175 4176 // No conflict between a tag and a non-tag. 4177 if (!NonTag) return false; 4178 4179 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4180 Diag(Target->getLocation(), diag::note_using_decl_target); 4181 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4182 return true; 4183} 4184 4185/// Builds a shadow declaration corresponding to a 'using' declaration. 4186UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4187 UsingDecl *UD, 4188 NamedDecl *Orig) { 4189 4190 // If we resolved to another shadow declaration, just coalesce them. 4191 NamedDecl *Target = Orig; 4192 if (isa<UsingShadowDecl>(Target)) { 4193 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4194 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4195 } 4196 4197 UsingShadowDecl *Shadow 4198 = UsingShadowDecl::Create(Context, CurContext, 4199 UD->getLocation(), UD, Target); 4200 UD->addShadowDecl(Shadow); 4201 4202 Shadow->setAccess(UD->getAccess()); 4203 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4204 Shadow->setInvalidDecl(); 4205 4206 if (S) 4207 PushOnScopeChains(Shadow, S); 4208 else 4209 CurContext->addDecl(Shadow); 4210 4211 4212 return Shadow; 4213} 4214 4215/// Hides a using shadow declaration. This is required by the current 4216/// using-decl implementation when a resolvable using declaration in a 4217/// class is followed by a declaration which would hide or override 4218/// one or more of the using decl's targets; for example: 4219/// 4220/// struct Base { void foo(int); }; 4221/// struct Derived : Base { 4222/// using Base::foo; 4223/// void foo(int); 4224/// }; 4225/// 4226/// The governing language is C++03 [namespace.udecl]p12: 4227/// 4228/// When a using-declaration brings names from a base class into a 4229/// derived class scope, member functions in the derived class 4230/// override and/or hide member functions with the same name and 4231/// parameter types in a base class (rather than conflicting). 4232/// 4233/// There are two ways to implement this: 4234/// (1) optimistically create shadow decls when they're not hidden 4235/// by existing declarations, or 4236/// (2) don't create any shadow decls (or at least don't make them 4237/// visible) until we've fully parsed/instantiated the class. 4238/// The problem with (1) is that we might have to retroactively remove 4239/// a shadow decl, which requires several O(n) operations because the 4240/// decl structures are (very reasonably) not designed for removal. 4241/// (2) avoids this but is very fiddly and phase-dependent. 4242void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4243 if (Shadow->getDeclName().getNameKind() == 4244 DeclarationName::CXXConversionFunctionName) 4245 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4246 4247 // Remove it from the DeclContext... 4248 Shadow->getDeclContext()->removeDecl(Shadow); 4249 4250 // ...and the scope, if applicable... 4251 if (S) { 4252 S->RemoveDecl(Shadow); 4253 IdResolver.RemoveDecl(Shadow); 4254 } 4255 4256 // ...and the using decl. 4257 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4258 4259 // TODO: complain somehow if Shadow was used. It shouldn't 4260 // be possible for this to happen, because...? 4261} 4262 4263/// Builds a using declaration. 4264/// 4265/// \param IsInstantiation - Whether this call arises from an 4266/// instantiation of an unresolved using declaration. We treat 4267/// the lookup differently for these declarations. 4268NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4269 SourceLocation UsingLoc, 4270 CXXScopeSpec &SS, 4271 const DeclarationNameInfo &NameInfo, 4272 AttributeList *AttrList, 4273 bool IsInstantiation, 4274 bool IsTypeName, 4275 SourceLocation TypenameLoc) { 4276 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4277 SourceLocation IdentLoc = NameInfo.getLoc(); 4278 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4279 4280 // FIXME: We ignore attributes for now. 4281 4282 if (SS.isEmpty()) { 4283 Diag(IdentLoc, diag::err_using_requires_qualname); 4284 return 0; 4285 } 4286 4287 // Do the redeclaration lookup in the current scope. 4288 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4289 ForRedeclaration); 4290 Previous.setHideTags(false); 4291 if (S) { 4292 LookupName(Previous, S); 4293 4294 // It is really dumb that we have to do this. 4295 LookupResult::Filter F = Previous.makeFilter(); 4296 while (F.hasNext()) { 4297 NamedDecl *D = F.next(); 4298 if (!isDeclInScope(D, CurContext, S)) 4299 F.erase(); 4300 } 4301 F.done(); 4302 } else { 4303 assert(IsInstantiation && "no scope in non-instantiation"); 4304 assert(CurContext->isRecord() && "scope not record in instantiation"); 4305 LookupQualifiedName(Previous, CurContext); 4306 } 4307 4308 // Check for invalid redeclarations. 4309 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4310 return 0; 4311 4312 // Check for bad qualifiers. 4313 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4314 return 0; 4315 4316 DeclContext *LookupContext = computeDeclContext(SS); 4317 NamedDecl *D; 4318 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4319 if (!LookupContext) { 4320 if (IsTypeName) { 4321 // FIXME: not all declaration name kinds are legal here 4322 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4323 UsingLoc, TypenameLoc, 4324 QualifierLoc, 4325 IdentLoc, NameInfo.getName()); 4326 } else { 4327 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4328 QualifierLoc, NameInfo); 4329 } 4330 } else { 4331 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4332 NameInfo, IsTypeName); 4333 } 4334 D->setAccess(AS); 4335 CurContext->addDecl(D); 4336 4337 if (!LookupContext) return D; 4338 UsingDecl *UD = cast<UsingDecl>(D); 4339 4340 if (RequireCompleteDeclContext(SS, LookupContext)) { 4341 UD->setInvalidDecl(); 4342 return UD; 4343 } 4344 4345 // Constructor inheriting using decls get special treatment. 4346 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4347 if (CheckInheritedConstructorUsingDecl(UD)) 4348 UD->setInvalidDecl(); 4349 return UD; 4350 } 4351 4352 // Otherwise, look up the target name. 4353 4354 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4355 4356 // Unlike most lookups, we don't always want to hide tag 4357 // declarations: tag names are visible through the using declaration 4358 // even if hidden by ordinary names, *except* in a dependent context 4359 // where it's important for the sanity of two-phase lookup. 4360 if (!IsInstantiation) 4361 R.setHideTags(false); 4362 4363 LookupQualifiedName(R, LookupContext); 4364 4365 if (R.empty()) { 4366 Diag(IdentLoc, diag::err_no_member) 4367 << NameInfo.getName() << LookupContext << SS.getRange(); 4368 UD->setInvalidDecl(); 4369 return UD; 4370 } 4371 4372 if (R.isAmbiguous()) { 4373 UD->setInvalidDecl(); 4374 return UD; 4375 } 4376 4377 if (IsTypeName) { 4378 // If we asked for a typename and got a non-type decl, error out. 4379 if (!R.getAsSingle<TypeDecl>()) { 4380 Diag(IdentLoc, diag::err_using_typename_non_type); 4381 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4382 Diag((*I)->getUnderlyingDecl()->getLocation(), 4383 diag::note_using_decl_target); 4384 UD->setInvalidDecl(); 4385 return UD; 4386 } 4387 } else { 4388 // If we asked for a non-typename and we got a type, error out, 4389 // but only if this is an instantiation of an unresolved using 4390 // decl. Otherwise just silently find the type name. 4391 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4392 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4393 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4394 UD->setInvalidDecl(); 4395 return UD; 4396 } 4397 } 4398 4399 // C++0x N2914 [namespace.udecl]p6: 4400 // A using-declaration shall not name a namespace. 4401 if (R.getAsSingle<NamespaceDecl>()) { 4402 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4403 << SS.getRange(); 4404 UD->setInvalidDecl(); 4405 return UD; 4406 } 4407 4408 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4409 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4410 BuildUsingShadowDecl(S, UD, *I); 4411 } 4412 4413 return UD; 4414} 4415 4416/// Additional checks for a using declaration referring to a constructor name. 4417bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4418 if (UD->isTypeName()) { 4419 // FIXME: Cannot specify typename when specifying constructor 4420 return true; 4421 } 4422 4423 const Type *SourceType = UD->getQualifier()->getAsType(); 4424 assert(SourceType && 4425 "Using decl naming constructor doesn't have type in scope spec."); 4426 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4427 4428 // Check whether the named type is a direct base class. 4429 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4430 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4431 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4432 BaseIt != BaseE; ++BaseIt) { 4433 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4434 if (CanonicalSourceType == BaseType) 4435 break; 4436 } 4437 4438 if (BaseIt == BaseE) { 4439 // Did not find SourceType in the bases. 4440 Diag(UD->getUsingLocation(), 4441 diag::err_using_decl_constructor_not_in_direct_base) 4442 << UD->getNameInfo().getSourceRange() 4443 << QualType(SourceType, 0) << TargetClass; 4444 return true; 4445 } 4446 4447 BaseIt->setInheritConstructors(); 4448 4449 return false; 4450} 4451 4452/// Checks that the given using declaration is not an invalid 4453/// redeclaration. Note that this is checking only for the using decl 4454/// itself, not for any ill-formedness among the UsingShadowDecls. 4455bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4456 bool isTypeName, 4457 const CXXScopeSpec &SS, 4458 SourceLocation NameLoc, 4459 const LookupResult &Prev) { 4460 // C++03 [namespace.udecl]p8: 4461 // C++0x [namespace.udecl]p10: 4462 // A using-declaration is a declaration and can therefore be used 4463 // repeatedly where (and only where) multiple declarations are 4464 // allowed. 4465 // 4466 // That's in non-member contexts. 4467 if (!CurContext->getRedeclContext()->isRecord()) 4468 return false; 4469 4470 NestedNameSpecifier *Qual 4471 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4472 4473 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4474 NamedDecl *D = *I; 4475 4476 bool DTypename; 4477 NestedNameSpecifier *DQual; 4478 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4479 DTypename = UD->isTypeName(); 4480 DQual = UD->getQualifier(); 4481 } else if (UnresolvedUsingValueDecl *UD 4482 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4483 DTypename = false; 4484 DQual = UD->getQualifier(); 4485 } else if (UnresolvedUsingTypenameDecl *UD 4486 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4487 DTypename = true; 4488 DQual = UD->getQualifier(); 4489 } else continue; 4490 4491 // using decls differ if one says 'typename' and the other doesn't. 4492 // FIXME: non-dependent using decls? 4493 if (isTypeName != DTypename) continue; 4494 4495 // using decls differ if they name different scopes (but note that 4496 // template instantiation can cause this check to trigger when it 4497 // didn't before instantiation). 4498 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4499 Context.getCanonicalNestedNameSpecifier(DQual)) 4500 continue; 4501 4502 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4503 Diag(D->getLocation(), diag::note_using_decl) << 1; 4504 return true; 4505 } 4506 4507 return false; 4508} 4509 4510 4511/// Checks that the given nested-name qualifier used in a using decl 4512/// in the current context is appropriately related to the current 4513/// scope. If an error is found, diagnoses it and returns true. 4514bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4515 const CXXScopeSpec &SS, 4516 SourceLocation NameLoc) { 4517 DeclContext *NamedContext = computeDeclContext(SS); 4518 4519 if (!CurContext->isRecord()) { 4520 // C++03 [namespace.udecl]p3: 4521 // C++0x [namespace.udecl]p8: 4522 // A using-declaration for a class member shall be a member-declaration. 4523 4524 // If we weren't able to compute a valid scope, it must be a 4525 // dependent class scope. 4526 if (!NamedContext || NamedContext->isRecord()) { 4527 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4528 << SS.getRange(); 4529 return true; 4530 } 4531 4532 // Otherwise, everything is known to be fine. 4533 return false; 4534 } 4535 4536 // The current scope is a record. 4537 4538 // If the named context is dependent, we can't decide much. 4539 if (!NamedContext) { 4540 // FIXME: in C++0x, we can diagnose if we can prove that the 4541 // nested-name-specifier does not refer to a base class, which is 4542 // still possible in some cases. 4543 4544 // Otherwise we have to conservatively report that things might be 4545 // okay. 4546 return false; 4547 } 4548 4549 if (!NamedContext->isRecord()) { 4550 // Ideally this would point at the last name in the specifier, 4551 // but we don't have that level of source info. 4552 Diag(SS.getRange().getBegin(), 4553 diag::err_using_decl_nested_name_specifier_is_not_class) 4554 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4555 return true; 4556 } 4557 4558 if (!NamedContext->isDependentContext() && 4559 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4560 return true; 4561 4562 if (getLangOptions().CPlusPlus0x) { 4563 // C++0x [namespace.udecl]p3: 4564 // In a using-declaration used as a member-declaration, the 4565 // nested-name-specifier shall name a base class of the class 4566 // being defined. 4567 4568 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4569 cast<CXXRecordDecl>(NamedContext))) { 4570 if (CurContext == NamedContext) { 4571 Diag(NameLoc, 4572 diag::err_using_decl_nested_name_specifier_is_current_class) 4573 << SS.getRange(); 4574 return true; 4575 } 4576 4577 Diag(SS.getRange().getBegin(), 4578 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4579 << (NestedNameSpecifier*) SS.getScopeRep() 4580 << cast<CXXRecordDecl>(CurContext) 4581 << SS.getRange(); 4582 return true; 4583 } 4584 4585 return false; 4586 } 4587 4588 // C++03 [namespace.udecl]p4: 4589 // A using-declaration used as a member-declaration shall refer 4590 // to a member of a base class of the class being defined [etc.]. 4591 4592 // Salient point: SS doesn't have to name a base class as long as 4593 // lookup only finds members from base classes. Therefore we can 4594 // diagnose here only if we can prove that that can't happen, 4595 // i.e. if the class hierarchies provably don't intersect. 4596 4597 // TODO: it would be nice if "definitely valid" results were cached 4598 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4599 // need to be repeated. 4600 4601 struct UserData { 4602 llvm::DenseSet<const CXXRecordDecl*> Bases; 4603 4604 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4605 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4606 Data->Bases.insert(Base); 4607 return true; 4608 } 4609 4610 bool hasDependentBases(const CXXRecordDecl *Class) { 4611 return !Class->forallBases(collect, this); 4612 } 4613 4614 /// Returns true if the base is dependent or is one of the 4615 /// accumulated base classes. 4616 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4617 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4618 return !Data->Bases.count(Base); 4619 } 4620 4621 bool mightShareBases(const CXXRecordDecl *Class) { 4622 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4623 } 4624 }; 4625 4626 UserData Data; 4627 4628 // Returns false if we find a dependent base. 4629 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4630 return false; 4631 4632 // Returns false if the class has a dependent base or if it or one 4633 // of its bases is present in the base set of the current context. 4634 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4635 return false; 4636 4637 Diag(SS.getRange().getBegin(), 4638 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4639 << (NestedNameSpecifier*) SS.getScopeRep() 4640 << cast<CXXRecordDecl>(CurContext) 4641 << SS.getRange(); 4642 4643 return true; 4644} 4645 4646Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4647 SourceLocation NamespaceLoc, 4648 SourceLocation AliasLoc, 4649 IdentifierInfo *Alias, 4650 CXXScopeSpec &SS, 4651 SourceLocation IdentLoc, 4652 IdentifierInfo *Ident) { 4653 4654 // Lookup the namespace name. 4655 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4656 LookupParsedName(R, S, &SS); 4657 4658 // Check if we have a previous declaration with the same name. 4659 NamedDecl *PrevDecl 4660 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4661 ForRedeclaration); 4662 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4663 PrevDecl = 0; 4664 4665 if (PrevDecl) { 4666 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4667 // We already have an alias with the same name that points to the same 4668 // namespace, so don't create a new one. 4669 // FIXME: At some point, we'll want to create the (redundant) 4670 // declaration to maintain better source information. 4671 if (!R.isAmbiguous() && !R.empty() && 4672 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4673 return 0; 4674 } 4675 4676 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4677 diag::err_redefinition_different_kind; 4678 Diag(AliasLoc, DiagID) << Alias; 4679 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4680 return 0; 4681 } 4682 4683 if (R.isAmbiguous()) 4684 return 0; 4685 4686 if (R.empty()) { 4687 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4688 CTC_NoKeywords, 0)) { 4689 if (R.getAsSingle<NamespaceDecl>() || 4690 R.getAsSingle<NamespaceAliasDecl>()) { 4691 if (DeclContext *DC = computeDeclContext(SS, false)) 4692 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4693 << Ident << DC << Corrected << SS.getRange() 4694 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4695 else 4696 Diag(IdentLoc, diag::err_using_directive_suggest) 4697 << Ident << Corrected 4698 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4699 4700 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4701 << Corrected; 4702 4703 Ident = Corrected.getAsIdentifierInfo(); 4704 } else { 4705 R.clear(); 4706 R.setLookupName(Ident); 4707 } 4708 } 4709 4710 if (R.empty()) { 4711 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4712 return 0; 4713 } 4714 } 4715 4716 NamespaceAliasDecl *AliasDecl = 4717 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4718 Alias, SS.getWithLocInContext(Context), 4719 IdentLoc, R.getFoundDecl()); 4720 4721 PushOnScopeChains(AliasDecl, S); 4722 return AliasDecl; 4723} 4724 4725namespace { 4726 /// \brief Scoped object used to handle the state changes required in Sema 4727 /// to implicitly define the body of a C++ member function; 4728 class ImplicitlyDefinedFunctionScope { 4729 Sema &S; 4730 Sema::ContextRAII SavedContext; 4731 4732 public: 4733 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4734 : S(S), SavedContext(S, Method) 4735 { 4736 S.PushFunctionScope(); 4737 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4738 } 4739 4740 ~ImplicitlyDefinedFunctionScope() { 4741 S.PopExpressionEvaluationContext(); 4742 S.PopFunctionOrBlockScope(); 4743 } 4744 }; 4745} 4746 4747static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4748 CXXRecordDecl *D) { 4749 ASTContext &Context = Self.Context; 4750 QualType ClassType = Context.getTypeDeclType(D); 4751 DeclarationName ConstructorName 4752 = Context.DeclarationNames.getCXXConstructorName( 4753 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4754 4755 DeclContext::lookup_const_iterator Con, ConEnd; 4756 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4757 Con != ConEnd; ++Con) { 4758 // FIXME: In C++0x, a constructor template can be a default constructor. 4759 if (isa<FunctionTemplateDecl>(*Con)) 4760 continue; 4761 4762 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4763 if (Constructor->isDefaultConstructor()) 4764 return Constructor; 4765 } 4766 return 0; 4767} 4768 4769CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4770 CXXRecordDecl *ClassDecl) { 4771 // C++ [class.ctor]p5: 4772 // A default constructor for a class X is a constructor of class X 4773 // that can be called without an argument. If there is no 4774 // user-declared constructor for class X, a default constructor is 4775 // implicitly declared. An implicitly-declared default constructor 4776 // is an inline public member of its class. 4777 assert(!ClassDecl->hasUserDeclaredConstructor() && 4778 "Should not build implicit default constructor!"); 4779 4780 // C++ [except.spec]p14: 4781 // An implicitly declared special member function (Clause 12) shall have an 4782 // exception-specification. [...] 4783 ImplicitExceptionSpecification ExceptSpec(Context); 4784 4785 // Direct base-class constructors. 4786 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4787 BEnd = ClassDecl->bases_end(); 4788 B != BEnd; ++B) { 4789 if (B->isVirtual()) // Handled below. 4790 continue; 4791 4792 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4793 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4794 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4795 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4796 else if (CXXConstructorDecl *Constructor 4797 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4798 ExceptSpec.CalledDecl(Constructor); 4799 } 4800 } 4801 4802 // Virtual base-class constructors. 4803 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4804 BEnd = ClassDecl->vbases_end(); 4805 B != BEnd; ++B) { 4806 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4807 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4808 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4809 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4810 else if (CXXConstructorDecl *Constructor 4811 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4812 ExceptSpec.CalledDecl(Constructor); 4813 } 4814 } 4815 4816 // Field constructors. 4817 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4818 FEnd = ClassDecl->field_end(); 4819 F != FEnd; ++F) { 4820 if (const RecordType *RecordTy 4821 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4822 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4823 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4824 ExceptSpec.CalledDecl( 4825 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4826 else if (CXXConstructorDecl *Constructor 4827 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4828 ExceptSpec.CalledDecl(Constructor); 4829 } 4830 } 4831 4832 FunctionProtoType::ExtProtoInfo EPI; 4833 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4834 EPI.NumExceptions = ExceptSpec.size(); 4835 EPI.Exceptions = ExceptSpec.data(); 4836 4837 // Create the actual constructor declaration. 4838 CanQualType ClassType 4839 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4840 SourceLocation ClassLoc = ClassDecl->getLocation(); 4841 DeclarationName Name 4842 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4843 DeclarationNameInfo NameInfo(Name, ClassLoc); 4844 CXXConstructorDecl *DefaultCon 4845 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4846 Context.getFunctionType(Context.VoidTy, 4847 0, 0, EPI), 4848 /*TInfo=*/0, 4849 /*isExplicit=*/false, 4850 /*isInline=*/true, 4851 /*isImplicitlyDeclared=*/true); 4852 DefaultCon->setAccess(AS_public); 4853 DefaultCon->setImplicit(); 4854 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4855 4856 // Note that we have declared this constructor. 4857 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4858 4859 if (Scope *S = getScopeForContext(ClassDecl)) 4860 PushOnScopeChains(DefaultCon, S, false); 4861 ClassDecl->addDecl(DefaultCon); 4862 4863 return DefaultCon; 4864} 4865 4866void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4867 CXXConstructorDecl *Constructor) { 4868 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4869 !Constructor->isUsed(false)) && 4870 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4871 4872 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4873 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4874 4875 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4876 DiagnosticErrorTrap Trap(Diags); 4877 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4878 Trap.hasErrorOccurred()) { 4879 Diag(CurrentLocation, diag::note_member_synthesized_at) 4880 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4881 Constructor->setInvalidDecl(); 4882 return; 4883 } 4884 4885 SourceLocation Loc = Constructor->getLocation(); 4886 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4887 4888 Constructor->setUsed(); 4889 MarkVTableUsed(CurrentLocation, ClassDecl); 4890} 4891 4892void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4893 // We start with an initial pass over the base classes to collect those that 4894 // inherit constructors from. If there are none, we can forgo all further 4895 // processing. 4896 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4897 BasesVector BasesToInheritFrom; 4898 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4899 BaseE = ClassDecl->bases_end(); 4900 BaseIt != BaseE; ++BaseIt) { 4901 if (BaseIt->getInheritConstructors()) { 4902 QualType Base = BaseIt->getType(); 4903 if (Base->isDependentType()) { 4904 // If we inherit constructors from anything that is dependent, just 4905 // abort processing altogether. We'll get another chance for the 4906 // instantiations. 4907 return; 4908 } 4909 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4910 } 4911 } 4912 if (BasesToInheritFrom.empty()) 4913 return; 4914 4915 // Now collect the constructors that we already have in the current class. 4916 // Those take precedence over inherited constructors. 4917 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4918 // unless there is a user-declared constructor with the same signature in 4919 // the class where the using-declaration appears. 4920 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4921 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4922 CtorE = ClassDecl->ctor_end(); 4923 CtorIt != CtorE; ++CtorIt) { 4924 ExistingConstructors.insert( 4925 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4926 } 4927 4928 Scope *S = getScopeForContext(ClassDecl); 4929 DeclarationName CreatedCtorName = 4930 Context.DeclarationNames.getCXXConstructorName( 4931 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4932 4933 // Now comes the true work. 4934 // First, we keep a map from constructor types to the base that introduced 4935 // them. Needed for finding conflicting constructors. We also keep the 4936 // actually inserted declarations in there, for pretty diagnostics. 4937 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4938 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4939 ConstructorToSourceMap InheritedConstructors; 4940 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4941 BaseE = BasesToInheritFrom.end(); 4942 BaseIt != BaseE; ++BaseIt) { 4943 const RecordType *Base = *BaseIt; 4944 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4945 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4946 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4947 CtorE = BaseDecl->ctor_end(); 4948 CtorIt != CtorE; ++CtorIt) { 4949 // Find the using declaration for inheriting this base's constructors. 4950 DeclarationName Name = 4951 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4952 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4953 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4954 SourceLocation UsingLoc = UD ? UD->getLocation() : 4955 ClassDecl->getLocation(); 4956 4957 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4958 // from the class X named in the using-declaration consists of actual 4959 // constructors and notional constructors that result from the 4960 // transformation of defaulted parameters as follows: 4961 // - all non-template default constructors of X, and 4962 // - for each non-template constructor of X that has at least one 4963 // parameter with a default argument, the set of constructors that 4964 // results from omitting any ellipsis parameter specification and 4965 // successively omitting parameters with a default argument from the 4966 // end of the parameter-type-list. 4967 CXXConstructorDecl *BaseCtor = *CtorIt; 4968 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4969 const FunctionProtoType *BaseCtorType = 4970 BaseCtor->getType()->getAs<FunctionProtoType>(); 4971 4972 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4973 maxParams = BaseCtor->getNumParams(); 4974 params <= maxParams; ++params) { 4975 // Skip default constructors. They're never inherited. 4976 if (params == 0) 4977 continue; 4978 // Skip copy and move constructors for the same reason. 4979 if (CanBeCopyOrMove && params == 1) 4980 continue; 4981 4982 // Build up a function type for this particular constructor. 4983 // FIXME: The working paper does not consider that the exception spec 4984 // for the inheriting constructor might be larger than that of the 4985 // source. This code doesn't yet, either. 4986 const Type *NewCtorType; 4987 if (params == maxParams) 4988 NewCtorType = BaseCtorType; 4989 else { 4990 llvm::SmallVector<QualType, 16> Args; 4991 for (unsigned i = 0; i < params; ++i) { 4992 Args.push_back(BaseCtorType->getArgType(i)); 4993 } 4994 FunctionProtoType::ExtProtoInfo ExtInfo = 4995 BaseCtorType->getExtProtoInfo(); 4996 ExtInfo.Variadic = false; 4997 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4998 Args.data(), params, ExtInfo) 4999 .getTypePtr(); 5000 } 5001 const Type *CanonicalNewCtorType = 5002 Context.getCanonicalType(NewCtorType); 5003 5004 // Now that we have the type, first check if the class already has a 5005 // constructor with this signature. 5006 if (ExistingConstructors.count(CanonicalNewCtorType)) 5007 continue; 5008 5009 // Then we check if we have already declared an inherited constructor 5010 // with this signature. 5011 std::pair<ConstructorToSourceMap::iterator, bool> result = 5012 InheritedConstructors.insert(std::make_pair( 5013 CanonicalNewCtorType, 5014 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5015 if (!result.second) { 5016 // Already in the map. If it came from a different class, that's an 5017 // error. Not if it's from the same. 5018 CanQualType PreviousBase = result.first->second.first; 5019 if (CanonicalBase != PreviousBase) { 5020 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5021 const CXXConstructorDecl *PrevBaseCtor = 5022 PrevCtor->getInheritedConstructor(); 5023 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5024 5025 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5026 Diag(BaseCtor->getLocation(), 5027 diag::note_using_decl_constructor_conflict_current_ctor); 5028 Diag(PrevBaseCtor->getLocation(), 5029 diag::note_using_decl_constructor_conflict_previous_ctor); 5030 Diag(PrevCtor->getLocation(), 5031 diag::note_using_decl_constructor_conflict_previous_using); 5032 } 5033 continue; 5034 } 5035 5036 // OK, we're there, now add the constructor. 5037 // C++0x [class.inhctor]p8: [...] that would be performed by a 5038 // user-writtern inline constructor [...] 5039 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5040 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5041 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5042 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5043 /*ImplicitlyDeclared=*/true); 5044 NewCtor->setAccess(BaseCtor->getAccess()); 5045 5046 // Build up the parameter decls and add them. 5047 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5048 for (unsigned i = 0; i < params; ++i) { 5049 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5050 UsingLoc, UsingLoc, 5051 /*IdentifierInfo=*/0, 5052 BaseCtorType->getArgType(i), 5053 /*TInfo=*/0, SC_None, 5054 SC_None, /*DefaultArg=*/0)); 5055 } 5056 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5057 NewCtor->setInheritedConstructor(BaseCtor); 5058 5059 PushOnScopeChains(NewCtor, S, false); 5060 ClassDecl->addDecl(NewCtor); 5061 result.first->second.second = NewCtor; 5062 } 5063 } 5064 } 5065} 5066 5067CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5068 // C++ [class.dtor]p2: 5069 // If a class has no user-declared destructor, a destructor is 5070 // declared implicitly. An implicitly-declared destructor is an 5071 // inline public member of its class. 5072 5073 // C++ [except.spec]p14: 5074 // An implicitly declared special member function (Clause 12) shall have 5075 // an exception-specification. 5076 ImplicitExceptionSpecification ExceptSpec(Context); 5077 5078 // Direct base-class destructors. 5079 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5080 BEnd = ClassDecl->bases_end(); 5081 B != BEnd; ++B) { 5082 if (B->isVirtual()) // Handled below. 5083 continue; 5084 5085 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5086 ExceptSpec.CalledDecl( 5087 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5088 } 5089 5090 // Virtual base-class destructors. 5091 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5092 BEnd = ClassDecl->vbases_end(); 5093 B != BEnd; ++B) { 5094 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5095 ExceptSpec.CalledDecl( 5096 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5097 } 5098 5099 // Field destructors. 5100 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5101 FEnd = ClassDecl->field_end(); 5102 F != FEnd; ++F) { 5103 if (const RecordType *RecordTy 5104 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5105 ExceptSpec.CalledDecl( 5106 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5107 } 5108 5109 // Create the actual destructor declaration. 5110 FunctionProtoType::ExtProtoInfo EPI; 5111 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5112 EPI.NumExceptions = ExceptSpec.size(); 5113 EPI.Exceptions = ExceptSpec.data(); 5114 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5115 5116 CanQualType ClassType 5117 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5118 SourceLocation ClassLoc = ClassDecl->getLocation(); 5119 DeclarationName Name 5120 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5121 DeclarationNameInfo NameInfo(Name, ClassLoc); 5122 CXXDestructorDecl *Destructor 5123 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5124 /*isInline=*/true, 5125 /*isImplicitlyDeclared=*/true); 5126 Destructor->setAccess(AS_public); 5127 Destructor->setImplicit(); 5128 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5129 5130 // Note that we have declared this destructor. 5131 ++ASTContext::NumImplicitDestructorsDeclared; 5132 5133 // Introduce this destructor into its scope. 5134 if (Scope *S = getScopeForContext(ClassDecl)) 5135 PushOnScopeChains(Destructor, S, false); 5136 ClassDecl->addDecl(Destructor); 5137 5138 // This could be uniqued if it ever proves significant. 5139 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5140 5141 AddOverriddenMethods(ClassDecl, Destructor); 5142 5143 return Destructor; 5144} 5145 5146void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5147 CXXDestructorDecl *Destructor) { 5148 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5149 "DefineImplicitDestructor - call it for implicit default dtor"); 5150 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5151 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5152 5153 if (Destructor->isInvalidDecl()) 5154 return; 5155 5156 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5157 5158 DiagnosticErrorTrap Trap(Diags); 5159 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5160 Destructor->getParent()); 5161 5162 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5163 Diag(CurrentLocation, diag::note_member_synthesized_at) 5164 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5165 5166 Destructor->setInvalidDecl(); 5167 return; 5168 } 5169 5170 SourceLocation Loc = Destructor->getLocation(); 5171 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5172 5173 Destructor->setUsed(); 5174 MarkVTableUsed(CurrentLocation, ClassDecl); 5175} 5176 5177/// \brief Builds a statement that copies the given entity from \p From to 5178/// \c To. 5179/// 5180/// This routine is used to copy the members of a class with an 5181/// implicitly-declared copy assignment operator. When the entities being 5182/// copied are arrays, this routine builds for loops to copy them. 5183/// 5184/// \param S The Sema object used for type-checking. 5185/// 5186/// \param Loc The location where the implicit copy is being generated. 5187/// 5188/// \param T The type of the expressions being copied. Both expressions must 5189/// have this type. 5190/// 5191/// \param To The expression we are copying to. 5192/// 5193/// \param From The expression we are copying from. 5194/// 5195/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5196/// Otherwise, it's a non-static member subobject. 5197/// 5198/// \param Depth Internal parameter recording the depth of the recursion. 5199/// 5200/// \returns A statement or a loop that copies the expressions. 5201static StmtResult 5202BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5203 Expr *To, Expr *From, 5204 bool CopyingBaseSubobject, unsigned Depth = 0) { 5205 // C++0x [class.copy]p30: 5206 // Each subobject is assigned in the manner appropriate to its type: 5207 // 5208 // - if the subobject is of class type, the copy assignment operator 5209 // for the class is used (as if by explicit qualification; that is, 5210 // ignoring any possible virtual overriding functions in more derived 5211 // classes); 5212 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5213 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5214 5215 // Look for operator=. 5216 DeclarationName Name 5217 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5218 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5219 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5220 5221 // Filter out any result that isn't a copy-assignment operator. 5222 LookupResult::Filter F = OpLookup.makeFilter(); 5223 while (F.hasNext()) { 5224 NamedDecl *D = F.next(); 5225 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5226 if (Method->isCopyAssignmentOperator()) 5227 continue; 5228 5229 F.erase(); 5230 } 5231 F.done(); 5232 5233 // Suppress the protected check (C++ [class.protected]) for each of the 5234 // assignment operators we found. This strange dance is required when 5235 // we're assigning via a base classes's copy-assignment operator. To 5236 // ensure that we're getting the right base class subobject (without 5237 // ambiguities), we need to cast "this" to that subobject type; to 5238 // ensure that we don't go through the virtual call mechanism, we need 5239 // to qualify the operator= name with the base class (see below). However, 5240 // this means that if the base class has a protected copy assignment 5241 // operator, the protected member access check will fail. So, we 5242 // rewrite "protected" access to "public" access in this case, since we 5243 // know by construction that we're calling from a derived class. 5244 if (CopyingBaseSubobject) { 5245 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5246 L != LEnd; ++L) { 5247 if (L.getAccess() == AS_protected) 5248 L.setAccess(AS_public); 5249 } 5250 } 5251 5252 // Create the nested-name-specifier that will be used to qualify the 5253 // reference to operator=; this is required to suppress the virtual 5254 // call mechanism. 5255 CXXScopeSpec SS; 5256 SS.MakeTrivial(S.Context, 5257 NestedNameSpecifier::Create(S.Context, 0, false, 5258 T.getTypePtr()), 5259 Loc); 5260 5261 // Create the reference to operator=. 5262 ExprResult OpEqualRef 5263 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5264 /*FirstQualifierInScope=*/0, OpLookup, 5265 /*TemplateArgs=*/0, 5266 /*SuppressQualifierCheck=*/true); 5267 if (OpEqualRef.isInvalid()) 5268 return StmtError(); 5269 5270 // Build the call to the assignment operator. 5271 5272 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5273 OpEqualRef.takeAs<Expr>(), 5274 Loc, &From, 1, Loc); 5275 if (Call.isInvalid()) 5276 return StmtError(); 5277 5278 return S.Owned(Call.takeAs<Stmt>()); 5279 } 5280 5281 // - if the subobject is of scalar type, the built-in assignment 5282 // operator is used. 5283 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5284 if (!ArrayTy) { 5285 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5286 if (Assignment.isInvalid()) 5287 return StmtError(); 5288 5289 return S.Owned(Assignment.takeAs<Stmt>()); 5290 } 5291 5292 // - if the subobject is an array, each element is assigned, in the 5293 // manner appropriate to the element type; 5294 5295 // Construct a loop over the array bounds, e.g., 5296 // 5297 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5298 // 5299 // that will copy each of the array elements. 5300 QualType SizeType = S.Context.getSizeType(); 5301 5302 // Create the iteration variable. 5303 IdentifierInfo *IterationVarName = 0; 5304 { 5305 llvm::SmallString<8> Str; 5306 llvm::raw_svector_ostream OS(Str); 5307 OS << "__i" << Depth; 5308 IterationVarName = &S.Context.Idents.get(OS.str()); 5309 } 5310 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5311 IterationVarName, SizeType, 5312 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5313 SC_None, SC_None); 5314 5315 // Initialize the iteration variable to zero. 5316 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5317 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5318 5319 // Create a reference to the iteration variable; we'll use this several 5320 // times throughout. 5321 Expr *IterationVarRef 5322 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5323 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5324 5325 // Create the DeclStmt that holds the iteration variable. 5326 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5327 5328 // Create the comparison against the array bound. 5329 llvm::APInt Upper 5330 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5331 Expr *Comparison 5332 = new (S.Context) BinaryOperator(IterationVarRef, 5333 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5334 BO_NE, S.Context.BoolTy, 5335 VK_RValue, OK_Ordinary, Loc); 5336 5337 // Create the pre-increment of the iteration variable. 5338 Expr *Increment 5339 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5340 VK_LValue, OK_Ordinary, Loc); 5341 5342 // Subscript the "from" and "to" expressions with the iteration variable. 5343 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5344 IterationVarRef, Loc)); 5345 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5346 IterationVarRef, Loc)); 5347 5348 // Build the copy for an individual element of the array. 5349 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5350 To, From, CopyingBaseSubobject, 5351 Depth + 1); 5352 if (Copy.isInvalid()) 5353 return StmtError(); 5354 5355 // Construct the loop that copies all elements of this array. 5356 return S.ActOnForStmt(Loc, Loc, InitStmt, 5357 S.MakeFullExpr(Comparison), 5358 0, S.MakeFullExpr(Increment), 5359 Loc, Copy.take()); 5360} 5361 5362/// \brief Determine whether the given class has a copy assignment operator 5363/// that accepts a const-qualified argument. 5364static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5365 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5366 5367 if (!Class->hasDeclaredCopyAssignment()) 5368 S.DeclareImplicitCopyAssignment(Class); 5369 5370 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5371 DeclarationName OpName 5372 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5373 5374 DeclContext::lookup_const_iterator Op, OpEnd; 5375 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5376 // C++ [class.copy]p9: 5377 // A user-declared copy assignment operator is a non-static non-template 5378 // member function of class X with exactly one parameter of type X, X&, 5379 // const X&, volatile X& or const volatile X&. 5380 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5381 if (!Method) 5382 continue; 5383 5384 if (Method->isStatic()) 5385 continue; 5386 if (Method->getPrimaryTemplate()) 5387 continue; 5388 const FunctionProtoType *FnType = 5389 Method->getType()->getAs<FunctionProtoType>(); 5390 assert(FnType && "Overloaded operator has no prototype."); 5391 // Don't assert on this; an invalid decl might have been left in the AST. 5392 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5393 continue; 5394 bool AcceptsConst = true; 5395 QualType ArgType = FnType->getArgType(0); 5396 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5397 ArgType = Ref->getPointeeType(); 5398 // Is it a non-const lvalue reference? 5399 if (!ArgType.isConstQualified()) 5400 AcceptsConst = false; 5401 } 5402 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5403 continue; 5404 5405 // We have a single argument of type cv X or cv X&, i.e. we've found the 5406 // copy assignment operator. Return whether it accepts const arguments. 5407 return AcceptsConst; 5408 } 5409 assert(Class->isInvalidDecl() && 5410 "No copy assignment operator declared in valid code."); 5411 return false; 5412} 5413 5414CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5415 // Note: The following rules are largely analoguous to the copy 5416 // constructor rules. Note that virtual bases are not taken into account 5417 // for determining the argument type of the operator. Note also that 5418 // operators taking an object instead of a reference are allowed. 5419 5420 5421 // C++ [class.copy]p10: 5422 // If the class definition does not explicitly declare a copy 5423 // assignment operator, one is declared implicitly. 5424 // The implicitly-defined copy assignment operator for a class X 5425 // will have the form 5426 // 5427 // X& X::operator=(const X&) 5428 // 5429 // if 5430 bool HasConstCopyAssignment = true; 5431 5432 // -- each direct base class B of X has a copy assignment operator 5433 // whose parameter is of type const B&, const volatile B& or B, 5434 // and 5435 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5436 BaseEnd = ClassDecl->bases_end(); 5437 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5438 assert(!Base->getType()->isDependentType() && 5439 "Cannot generate implicit members for class with dependent bases."); 5440 const CXXRecordDecl *BaseClassDecl 5441 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5442 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5443 } 5444 5445 // -- for all the nonstatic data members of X that are of a class 5446 // type M (or array thereof), each such class type has a copy 5447 // assignment operator whose parameter is of type const M&, 5448 // const volatile M& or M. 5449 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5450 FieldEnd = ClassDecl->field_end(); 5451 HasConstCopyAssignment && Field != FieldEnd; 5452 ++Field) { 5453 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5454 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5455 const CXXRecordDecl *FieldClassDecl 5456 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5457 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5458 } 5459 } 5460 5461 // Otherwise, the implicitly declared copy assignment operator will 5462 // have the form 5463 // 5464 // X& X::operator=(X&) 5465 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5466 QualType RetType = Context.getLValueReferenceType(ArgType); 5467 if (HasConstCopyAssignment) 5468 ArgType = ArgType.withConst(); 5469 ArgType = Context.getLValueReferenceType(ArgType); 5470 5471 // C++ [except.spec]p14: 5472 // An implicitly declared special member function (Clause 12) shall have an 5473 // exception-specification. [...] 5474 ImplicitExceptionSpecification ExceptSpec(Context); 5475 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5476 BaseEnd = ClassDecl->bases_end(); 5477 Base != BaseEnd; ++Base) { 5478 CXXRecordDecl *BaseClassDecl 5479 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5480 5481 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5482 DeclareImplicitCopyAssignment(BaseClassDecl); 5483 5484 if (CXXMethodDecl *CopyAssign 5485 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5486 ExceptSpec.CalledDecl(CopyAssign); 5487 } 5488 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5489 FieldEnd = ClassDecl->field_end(); 5490 Field != FieldEnd; 5491 ++Field) { 5492 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5493 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5494 CXXRecordDecl *FieldClassDecl 5495 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5496 5497 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5498 DeclareImplicitCopyAssignment(FieldClassDecl); 5499 5500 if (CXXMethodDecl *CopyAssign 5501 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5502 ExceptSpec.CalledDecl(CopyAssign); 5503 } 5504 } 5505 5506 // An implicitly-declared copy assignment operator is an inline public 5507 // member of its class. 5508 FunctionProtoType::ExtProtoInfo EPI; 5509 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5510 EPI.NumExceptions = ExceptSpec.size(); 5511 EPI.Exceptions = ExceptSpec.data(); 5512 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5513 SourceLocation ClassLoc = ClassDecl->getLocation(); 5514 DeclarationNameInfo NameInfo(Name, ClassLoc); 5515 CXXMethodDecl *CopyAssignment 5516 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5517 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5518 /*TInfo=*/0, /*isStatic=*/false, 5519 /*StorageClassAsWritten=*/SC_None, 5520 /*isInline=*/true, 5521 SourceLocation()); 5522 CopyAssignment->setAccess(AS_public); 5523 CopyAssignment->setImplicit(); 5524 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5525 5526 // Add the parameter to the operator. 5527 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5528 ClassLoc, ClassLoc, /*Id=*/0, 5529 ArgType, /*TInfo=*/0, 5530 SC_None, 5531 SC_None, 0); 5532 CopyAssignment->setParams(&FromParam, 1); 5533 5534 // Note that we have added this copy-assignment operator. 5535 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5536 5537 if (Scope *S = getScopeForContext(ClassDecl)) 5538 PushOnScopeChains(CopyAssignment, S, false); 5539 ClassDecl->addDecl(CopyAssignment); 5540 5541 AddOverriddenMethods(ClassDecl, CopyAssignment); 5542 return CopyAssignment; 5543} 5544 5545void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5546 CXXMethodDecl *CopyAssignOperator) { 5547 assert((CopyAssignOperator->isImplicit() && 5548 CopyAssignOperator->isOverloadedOperator() && 5549 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5550 !CopyAssignOperator->isUsed(false)) && 5551 "DefineImplicitCopyAssignment called for wrong function"); 5552 5553 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5554 5555 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5556 CopyAssignOperator->setInvalidDecl(); 5557 return; 5558 } 5559 5560 CopyAssignOperator->setUsed(); 5561 5562 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5563 DiagnosticErrorTrap Trap(Diags); 5564 5565 // C++0x [class.copy]p30: 5566 // The implicitly-defined or explicitly-defaulted copy assignment operator 5567 // for a non-union class X performs memberwise copy assignment of its 5568 // subobjects. The direct base classes of X are assigned first, in the 5569 // order of their declaration in the base-specifier-list, and then the 5570 // immediate non-static data members of X are assigned, in the order in 5571 // which they were declared in the class definition. 5572 5573 // The statements that form the synthesized function body. 5574 ASTOwningVector<Stmt*> Statements(*this); 5575 5576 // The parameter for the "other" object, which we are copying from. 5577 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5578 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5579 QualType OtherRefType = Other->getType(); 5580 if (const LValueReferenceType *OtherRef 5581 = OtherRefType->getAs<LValueReferenceType>()) { 5582 OtherRefType = OtherRef->getPointeeType(); 5583 OtherQuals = OtherRefType.getQualifiers(); 5584 } 5585 5586 // Our location for everything implicitly-generated. 5587 SourceLocation Loc = CopyAssignOperator->getLocation(); 5588 5589 // Construct a reference to the "other" object. We'll be using this 5590 // throughout the generated ASTs. 5591 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5592 assert(OtherRef && "Reference to parameter cannot fail!"); 5593 5594 // Construct the "this" pointer. We'll be using this throughout the generated 5595 // ASTs. 5596 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5597 assert(This && "Reference to this cannot fail!"); 5598 5599 // Assign base classes. 5600 bool Invalid = false; 5601 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5602 E = ClassDecl->bases_end(); Base != E; ++Base) { 5603 // Form the assignment: 5604 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5605 QualType BaseType = Base->getType().getUnqualifiedType(); 5606 if (!BaseType->isRecordType()) { 5607 Invalid = true; 5608 continue; 5609 } 5610 5611 CXXCastPath BasePath; 5612 BasePath.push_back(Base); 5613 5614 // Construct the "from" expression, which is an implicit cast to the 5615 // appropriately-qualified base type. 5616 Expr *From = OtherRef; 5617 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5618 CK_UncheckedDerivedToBase, 5619 VK_LValue, &BasePath).take(); 5620 5621 // Dereference "this". 5622 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5623 5624 // Implicitly cast "this" to the appropriately-qualified base type. 5625 To = ImpCastExprToType(To.take(), 5626 Context.getCVRQualifiedType(BaseType, 5627 CopyAssignOperator->getTypeQualifiers()), 5628 CK_UncheckedDerivedToBase, 5629 VK_LValue, &BasePath); 5630 5631 // Build the copy. 5632 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5633 To.get(), From, 5634 /*CopyingBaseSubobject=*/true); 5635 if (Copy.isInvalid()) { 5636 Diag(CurrentLocation, diag::note_member_synthesized_at) 5637 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5638 CopyAssignOperator->setInvalidDecl(); 5639 return; 5640 } 5641 5642 // Success! Record the copy. 5643 Statements.push_back(Copy.takeAs<Expr>()); 5644 } 5645 5646 // \brief Reference to the __builtin_memcpy function. 5647 Expr *BuiltinMemCpyRef = 0; 5648 // \brief Reference to the __builtin_objc_memmove_collectable function. 5649 Expr *CollectableMemCpyRef = 0; 5650 5651 // Assign non-static members. 5652 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5653 FieldEnd = ClassDecl->field_end(); 5654 Field != FieldEnd; ++Field) { 5655 // Check for members of reference type; we can't copy those. 5656 if (Field->getType()->isReferenceType()) { 5657 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5658 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5659 Diag(Field->getLocation(), diag::note_declared_at); 5660 Diag(CurrentLocation, diag::note_member_synthesized_at) 5661 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5662 Invalid = true; 5663 continue; 5664 } 5665 5666 // Check for members of const-qualified, non-class type. 5667 QualType BaseType = Context.getBaseElementType(Field->getType()); 5668 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5669 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5670 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5671 Diag(Field->getLocation(), diag::note_declared_at); 5672 Diag(CurrentLocation, diag::note_member_synthesized_at) 5673 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5674 Invalid = true; 5675 continue; 5676 } 5677 5678 QualType FieldType = Field->getType().getNonReferenceType(); 5679 if (FieldType->isIncompleteArrayType()) { 5680 assert(ClassDecl->hasFlexibleArrayMember() && 5681 "Incomplete array type is not valid"); 5682 continue; 5683 } 5684 5685 // Build references to the field in the object we're copying from and to. 5686 CXXScopeSpec SS; // Intentionally empty 5687 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5688 LookupMemberName); 5689 MemberLookup.addDecl(*Field); 5690 MemberLookup.resolveKind(); 5691 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5692 Loc, /*IsArrow=*/false, 5693 SS, 0, MemberLookup, 0); 5694 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5695 Loc, /*IsArrow=*/true, 5696 SS, 0, MemberLookup, 0); 5697 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5698 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5699 5700 // If the field should be copied with __builtin_memcpy rather than via 5701 // explicit assignments, do so. This optimization only applies for arrays 5702 // of scalars and arrays of class type with trivial copy-assignment 5703 // operators. 5704 if (FieldType->isArrayType() && 5705 (!BaseType->isRecordType() || 5706 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5707 ->hasTrivialCopyAssignment())) { 5708 // Compute the size of the memory buffer to be copied. 5709 QualType SizeType = Context.getSizeType(); 5710 llvm::APInt Size(Context.getTypeSize(SizeType), 5711 Context.getTypeSizeInChars(BaseType).getQuantity()); 5712 for (const ConstantArrayType *Array 5713 = Context.getAsConstantArrayType(FieldType); 5714 Array; 5715 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5716 llvm::APInt ArraySize 5717 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5718 Size *= ArraySize; 5719 } 5720 5721 // Take the address of the field references for "from" and "to". 5722 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5723 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5724 5725 bool NeedsCollectableMemCpy = 5726 (BaseType->isRecordType() && 5727 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5728 5729 if (NeedsCollectableMemCpy) { 5730 if (!CollectableMemCpyRef) { 5731 // Create a reference to the __builtin_objc_memmove_collectable function. 5732 LookupResult R(*this, 5733 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5734 Loc, LookupOrdinaryName); 5735 LookupName(R, TUScope, true); 5736 5737 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5738 if (!CollectableMemCpy) { 5739 // Something went horribly wrong earlier, and we will have 5740 // complained about it. 5741 Invalid = true; 5742 continue; 5743 } 5744 5745 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5746 CollectableMemCpy->getType(), 5747 VK_LValue, Loc, 0).take(); 5748 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5749 } 5750 } 5751 // Create a reference to the __builtin_memcpy builtin function. 5752 else if (!BuiltinMemCpyRef) { 5753 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5754 LookupOrdinaryName); 5755 LookupName(R, TUScope, true); 5756 5757 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5758 if (!BuiltinMemCpy) { 5759 // Something went horribly wrong earlier, and we will have complained 5760 // about it. 5761 Invalid = true; 5762 continue; 5763 } 5764 5765 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5766 BuiltinMemCpy->getType(), 5767 VK_LValue, Loc, 0).take(); 5768 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5769 } 5770 5771 ASTOwningVector<Expr*> CallArgs(*this); 5772 CallArgs.push_back(To.takeAs<Expr>()); 5773 CallArgs.push_back(From.takeAs<Expr>()); 5774 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5775 ExprResult Call = ExprError(); 5776 if (NeedsCollectableMemCpy) 5777 Call = ActOnCallExpr(/*Scope=*/0, 5778 CollectableMemCpyRef, 5779 Loc, move_arg(CallArgs), 5780 Loc); 5781 else 5782 Call = ActOnCallExpr(/*Scope=*/0, 5783 BuiltinMemCpyRef, 5784 Loc, move_arg(CallArgs), 5785 Loc); 5786 5787 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5788 Statements.push_back(Call.takeAs<Expr>()); 5789 continue; 5790 } 5791 5792 // Build the copy of this field. 5793 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5794 To.get(), From.get(), 5795 /*CopyingBaseSubobject=*/false); 5796 if (Copy.isInvalid()) { 5797 Diag(CurrentLocation, diag::note_member_synthesized_at) 5798 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5799 CopyAssignOperator->setInvalidDecl(); 5800 return; 5801 } 5802 5803 // Success! Record the copy. 5804 Statements.push_back(Copy.takeAs<Stmt>()); 5805 } 5806 5807 if (!Invalid) { 5808 // Add a "return *this;" 5809 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5810 5811 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5812 if (Return.isInvalid()) 5813 Invalid = true; 5814 else { 5815 Statements.push_back(Return.takeAs<Stmt>()); 5816 5817 if (Trap.hasErrorOccurred()) { 5818 Diag(CurrentLocation, diag::note_member_synthesized_at) 5819 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5820 Invalid = true; 5821 } 5822 } 5823 } 5824 5825 if (Invalid) { 5826 CopyAssignOperator->setInvalidDecl(); 5827 return; 5828 } 5829 5830 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5831 /*isStmtExpr=*/false); 5832 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5833 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5834} 5835 5836CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5837 CXXRecordDecl *ClassDecl) { 5838 // C++ [class.copy]p4: 5839 // If the class definition does not explicitly declare a copy 5840 // constructor, one is declared implicitly. 5841 5842 // C++ [class.copy]p5: 5843 // The implicitly-declared copy constructor for a class X will 5844 // have the form 5845 // 5846 // X::X(const X&) 5847 // 5848 // if 5849 bool HasConstCopyConstructor = true; 5850 5851 // -- each direct or virtual base class B of X has a copy 5852 // constructor whose first parameter is of type const B& or 5853 // const volatile B&, and 5854 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5855 BaseEnd = ClassDecl->bases_end(); 5856 HasConstCopyConstructor && Base != BaseEnd; 5857 ++Base) { 5858 // Virtual bases are handled below. 5859 if (Base->isVirtual()) 5860 continue; 5861 5862 CXXRecordDecl *BaseClassDecl 5863 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5864 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5865 DeclareImplicitCopyConstructor(BaseClassDecl); 5866 5867 HasConstCopyConstructor 5868 = BaseClassDecl->hasConstCopyConstructor(Context); 5869 } 5870 5871 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5872 BaseEnd = ClassDecl->vbases_end(); 5873 HasConstCopyConstructor && Base != BaseEnd; 5874 ++Base) { 5875 CXXRecordDecl *BaseClassDecl 5876 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5877 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5878 DeclareImplicitCopyConstructor(BaseClassDecl); 5879 5880 HasConstCopyConstructor 5881 = BaseClassDecl->hasConstCopyConstructor(Context); 5882 } 5883 5884 // -- for all the nonstatic data members of X that are of a 5885 // class type M (or array thereof), each such class type 5886 // has a copy constructor whose first parameter is of type 5887 // const M& or const volatile M&. 5888 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5889 FieldEnd = ClassDecl->field_end(); 5890 HasConstCopyConstructor && Field != FieldEnd; 5891 ++Field) { 5892 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5893 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5894 CXXRecordDecl *FieldClassDecl 5895 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5896 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5897 DeclareImplicitCopyConstructor(FieldClassDecl); 5898 5899 HasConstCopyConstructor 5900 = FieldClassDecl->hasConstCopyConstructor(Context); 5901 } 5902 } 5903 5904 // Otherwise, the implicitly declared copy constructor will have 5905 // the form 5906 // 5907 // X::X(X&) 5908 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5909 QualType ArgType = ClassType; 5910 if (HasConstCopyConstructor) 5911 ArgType = ArgType.withConst(); 5912 ArgType = Context.getLValueReferenceType(ArgType); 5913 5914 // C++ [except.spec]p14: 5915 // An implicitly declared special member function (Clause 12) shall have an 5916 // exception-specification. [...] 5917 ImplicitExceptionSpecification ExceptSpec(Context); 5918 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5920 BaseEnd = ClassDecl->bases_end(); 5921 Base != BaseEnd; 5922 ++Base) { 5923 // Virtual bases are handled below. 5924 if (Base->isVirtual()) 5925 continue; 5926 5927 CXXRecordDecl *BaseClassDecl 5928 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5929 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5930 DeclareImplicitCopyConstructor(BaseClassDecl); 5931 5932 if (CXXConstructorDecl *CopyConstructor 5933 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5934 ExceptSpec.CalledDecl(CopyConstructor); 5935 } 5936 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5937 BaseEnd = ClassDecl->vbases_end(); 5938 Base != BaseEnd; 5939 ++Base) { 5940 CXXRecordDecl *BaseClassDecl 5941 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5942 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5943 DeclareImplicitCopyConstructor(BaseClassDecl); 5944 5945 if (CXXConstructorDecl *CopyConstructor 5946 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5947 ExceptSpec.CalledDecl(CopyConstructor); 5948 } 5949 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5950 FieldEnd = ClassDecl->field_end(); 5951 Field != FieldEnd; 5952 ++Field) { 5953 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5954 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5955 CXXRecordDecl *FieldClassDecl 5956 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5957 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5958 DeclareImplicitCopyConstructor(FieldClassDecl); 5959 5960 if (CXXConstructorDecl *CopyConstructor 5961 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5962 ExceptSpec.CalledDecl(CopyConstructor); 5963 } 5964 } 5965 5966 // An implicitly-declared copy constructor is an inline public 5967 // member of its class. 5968 FunctionProtoType::ExtProtoInfo EPI; 5969 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5970 EPI.NumExceptions = ExceptSpec.size(); 5971 EPI.Exceptions = ExceptSpec.data(); 5972 DeclarationName Name 5973 = Context.DeclarationNames.getCXXConstructorName( 5974 Context.getCanonicalType(ClassType)); 5975 SourceLocation ClassLoc = ClassDecl->getLocation(); 5976 DeclarationNameInfo NameInfo(Name, ClassLoc); 5977 CXXConstructorDecl *CopyConstructor 5978 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5979 Context.getFunctionType(Context.VoidTy, 5980 &ArgType, 1, EPI), 5981 /*TInfo=*/0, 5982 /*isExplicit=*/false, 5983 /*isInline=*/true, 5984 /*isImplicitlyDeclared=*/true); 5985 CopyConstructor->setAccess(AS_public); 5986 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5987 5988 // Note that we have declared this constructor. 5989 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5990 5991 // Add the parameter to the constructor. 5992 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5993 ClassLoc, ClassLoc, 5994 /*IdentifierInfo=*/0, 5995 ArgType, /*TInfo=*/0, 5996 SC_None, 5997 SC_None, 0); 5998 CopyConstructor->setParams(&FromParam, 1); 5999 if (Scope *S = getScopeForContext(ClassDecl)) 6000 PushOnScopeChains(CopyConstructor, S, false); 6001 ClassDecl->addDecl(CopyConstructor); 6002 6003 return CopyConstructor; 6004} 6005 6006void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6007 CXXConstructorDecl *CopyConstructor, 6008 unsigned TypeQuals) { 6009 assert((CopyConstructor->isImplicit() && 6010 CopyConstructor->isCopyConstructor(TypeQuals) && 6011 !CopyConstructor->isUsed(false)) && 6012 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6013 6014 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6015 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6016 6017 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6018 DiagnosticErrorTrap Trap(Diags); 6019 6020 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6021 Trap.hasErrorOccurred()) { 6022 Diag(CurrentLocation, diag::note_member_synthesized_at) 6023 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6024 CopyConstructor->setInvalidDecl(); 6025 } else { 6026 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6027 CopyConstructor->getLocation(), 6028 MultiStmtArg(*this, 0, 0), 6029 /*isStmtExpr=*/false) 6030 .takeAs<Stmt>()); 6031 } 6032 6033 CopyConstructor->setUsed(); 6034} 6035 6036ExprResult 6037Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6038 CXXConstructorDecl *Constructor, 6039 MultiExprArg ExprArgs, 6040 bool RequiresZeroInit, 6041 unsigned ConstructKind, 6042 SourceRange ParenRange) { 6043 bool Elidable = false; 6044 6045 // C++0x [class.copy]p34: 6046 // When certain criteria are met, an implementation is allowed to 6047 // omit the copy/move construction of a class object, even if the 6048 // copy/move constructor and/or destructor for the object have 6049 // side effects. [...] 6050 // - when a temporary class object that has not been bound to a 6051 // reference (12.2) would be copied/moved to a class object 6052 // with the same cv-unqualified type, the copy/move operation 6053 // can be omitted by constructing the temporary object 6054 // directly into the target of the omitted copy/move 6055 if (ConstructKind == CXXConstructExpr::CK_Complete && 6056 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6057 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6058 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6059 } 6060 6061 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6062 Elidable, move(ExprArgs), RequiresZeroInit, 6063 ConstructKind, ParenRange); 6064} 6065 6066/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6067/// including handling of its default argument expressions. 6068ExprResult 6069Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6070 CXXConstructorDecl *Constructor, bool Elidable, 6071 MultiExprArg ExprArgs, 6072 bool RequiresZeroInit, 6073 unsigned ConstructKind, 6074 SourceRange ParenRange) { 6075 unsigned NumExprs = ExprArgs.size(); 6076 Expr **Exprs = (Expr **)ExprArgs.release(); 6077 6078 for (specific_attr_iterator<NonNullAttr> 6079 i = Constructor->specific_attr_begin<NonNullAttr>(), 6080 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6081 const NonNullAttr *NonNull = *i; 6082 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6083 } 6084 6085 MarkDeclarationReferenced(ConstructLoc, Constructor); 6086 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6087 Constructor, Elidable, Exprs, NumExprs, 6088 RequiresZeroInit, 6089 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6090 ParenRange)); 6091} 6092 6093bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6094 CXXConstructorDecl *Constructor, 6095 MultiExprArg Exprs) { 6096 // FIXME: Provide the correct paren SourceRange when available. 6097 ExprResult TempResult = 6098 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6099 move(Exprs), false, CXXConstructExpr::CK_Complete, 6100 SourceRange()); 6101 if (TempResult.isInvalid()) 6102 return true; 6103 6104 Expr *Temp = TempResult.takeAs<Expr>(); 6105 CheckImplicitConversions(Temp, VD->getLocation()); 6106 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6107 Temp = MaybeCreateExprWithCleanups(Temp); 6108 VD->setInit(Temp); 6109 6110 return false; 6111} 6112 6113void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6114 if (VD->isInvalidDecl()) return; 6115 6116 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6117 if (ClassDecl->isInvalidDecl()) return; 6118 if (ClassDecl->hasTrivialDestructor()) return; 6119 if (ClassDecl->isDependentContext()) return; 6120 6121 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6122 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6123 CheckDestructorAccess(VD->getLocation(), Destructor, 6124 PDiag(diag::err_access_dtor_var) 6125 << VD->getDeclName() 6126 << VD->getType()); 6127 6128 if (!VD->hasGlobalStorage()) return; 6129 6130 // Emit warning for non-trivial dtor in global scope (a real global, 6131 // class-static, function-static). 6132 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6133 6134 // TODO: this should be re-enabled for static locals by !CXAAtExit 6135 if (!VD->isStaticLocal()) 6136 Diag(VD->getLocation(), diag::warn_global_destructor); 6137} 6138 6139/// AddCXXDirectInitializerToDecl - This action is called immediately after 6140/// ActOnDeclarator, when a C++ direct initializer is present. 6141/// e.g: "int x(1);" 6142void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6143 SourceLocation LParenLoc, 6144 MultiExprArg Exprs, 6145 SourceLocation RParenLoc, 6146 bool TypeMayContainAuto) { 6147 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6148 6149 // If there is no declaration, there was an error parsing it. Just ignore 6150 // the initializer. 6151 if (RealDecl == 0) 6152 return; 6153 6154 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6155 if (!VDecl) { 6156 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6157 RealDecl->setInvalidDecl(); 6158 return; 6159 } 6160 6161 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6162 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6163 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6164 if (Exprs.size() > 1) { 6165 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6166 diag::err_auto_var_init_multiple_expressions) 6167 << VDecl->getDeclName() << VDecl->getType() 6168 << VDecl->getSourceRange(); 6169 RealDecl->setInvalidDecl(); 6170 return; 6171 } 6172 6173 Expr *Init = Exprs.get()[0]; 6174 TypeSourceInfo *DeducedType = 0; 6175 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6176 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6177 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6178 << Init->getSourceRange(); 6179 if (!DeducedType) { 6180 RealDecl->setInvalidDecl(); 6181 return; 6182 } 6183 VDecl->setTypeSourceInfo(DeducedType); 6184 VDecl->setType(DeducedType->getType()); 6185 6186 // If this is a redeclaration, check that the type we just deduced matches 6187 // the previously declared type. 6188 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6189 MergeVarDeclTypes(VDecl, Old); 6190 } 6191 6192 // We will represent direct-initialization similarly to copy-initialization: 6193 // int x(1); -as-> int x = 1; 6194 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6195 // 6196 // Clients that want to distinguish between the two forms, can check for 6197 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6198 // A major benefit is that clients that don't particularly care about which 6199 // exactly form was it (like the CodeGen) can handle both cases without 6200 // special case code. 6201 6202 // C++ 8.5p11: 6203 // The form of initialization (using parentheses or '=') is generally 6204 // insignificant, but does matter when the entity being initialized has a 6205 // class type. 6206 6207 if (!VDecl->getType()->isDependentType() && 6208 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6209 diag::err_typecheck_decl_incomplete_type)) { 6210 VDecl->setInvalidDecl(); 6211 return; 6212 } 6213 6214 // The variable can not have an abstract class type. 6215 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6216 diag::err_abstract_type_in_decl, 6217 AbstractVariableType)) 6218 VDecl->setInvalidDecl(); 6219 6220 const VarDecl *Def; 6221 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6222 Diag(VDecl->getLocation(), diag::err_redefinition) 6223 << VDecl->getDeclName(); 6224 Diag(Def->getLocation(), diag::note_previous_definition); 6225 VDecl->setInvalidDecl(); 6226 return; 6227 } 6228 6229 // C++ [class.static.data]p4 6230 // If a static data member is of const integral or const 6231 // enumeration type, its declaration in the class definition can 6232 // specify a constant-initializer which shall be an integral 6233 // constant expression (5.19). In that case, the member can appear 6234 // in integral constant expressions. The member shall still be 6235 // defined in a namespace scope if it is used in the program and the 6236 // namespace scope definition shall not contain an initializer. 6237 // 6238 // We already performed a redefinition check above, but for static 6239 // data members we also need to check whether there was an in-class 6240 // declaration with an initializer. 6241 const VarDecl* PrevInit = 0; 6242 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6243 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6244 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6245 return; 6246 } 6247 6248 bool IsDependent = false; 6249 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6250 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6251 VDecl->setInvalidDecl(); 6252 return; 6253 } 6254 6255 if (Exprs.get()[I]->isTypeDependent()) 6256 IsDependent = true; 6257 } 6258 6259 // If either the declaration has a dependent type or if any of the 6260 // expressions is type-dependent, we represent the initialization 6261 // via a ParenListExpr for later use during template instantiation. 6262 if (VDecl->getType()->isDependentType() || IsDependent) { 6263 // Let clients know that initialization was done with a direct initializer. 6264 VDecl->setCXXDirectInitializer(true); 6265 6266 // Store the initialization expressions as a ParenListExpr. 6267 unsigned NumExprs = Exprs.size(); 6268 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6269 (Expr **)Exprs.release(), 6270 NumExprs, RParenLoc)); 6271 return; 6272 } 6273 6274 // Capture the variable that is being initialized and the style of 6275 // initialization. 6276 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6277 6278 // FIXME: Poor source location information. 6279 InitializationKind Kind 6280 = InitializationKind::CreateDirect(VDecl->getLocation(), 6281 LParenLoc, RParenLoc); 6282 6283 InitializationSequence InitSeq(*this, Entity, Kind, 6284 Exprs.get(), Exprs.size()); 6285 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6286 if (Result.isInvalid()) { 6287 VDecl->setInvalidDecl(); 6288 return; 6289 } 6290 6291 CheckImplicitConversions(Result.get(), LParenLoc); 6292 6293 Result = MaybeCreateExprWithCleanups(Result); 6294 VDecl->setInit(Result.takeAs<Expr>()); 6295 VDecl->setCXXDirectInitializer(true); 6296 6297 CheckCompleteVariableDeclaration(VDecl); 6298} 6299 6300/// \brief Given a constructor and the set of arguments provided for the 6301/// constructor, convert the arguments and add any required default arguments 6302/// to form a proper call to this constructor. 6303/// 6304/// \returns true if an error occurred, false otherwise. 6305bool 6306Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6307 MultiExprArg ArgsPtr, 6308 SourceLocation Loc, 6309 ASTOwningVector<Expr*> &ConvertedArgs) { 6310 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6311 unsigned NumArgs = ArgsPtr.size(); 6312 Expr **Args = (Expr **)ArgsPtr.get(); 6313 6314 const FunctionProtoType *Proto 6315 = Constructor->getType()->getAs<FunctionProtoType>(); 6316 assert(Proto && "Constructor without a prototype?"); 6317 unsigned NumArgsInProto = Proto->getNumArgs(); 6318 6319 // If too few arguments are available, we'll fill in the rest with defaults. 6320 if (NumArgs < NumArgsInProto) 6321 ConvertedArgs.reserve(NumArgsInProto); 6322 else 6323 ConvertedArgs.reserve(NumArgs); 6324 6325 VariadicCallType CallType = 6326 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6327 llvm::SmallVector<Expr *, 8> AllArgs; 6328 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6329 Proto, 0, Args, NumArgs, AllArgs, 6330 CallType); 6331 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6332 ConvertedArgs.push_back(AllArgs[i]); 6333 return Invalid; 6334} 6335 6336static inline bool 6337CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6338 const FunctionDecl *FnDecl) { 6339 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6340 if (isa<NamespaceDecl>(DC)) { 6341 return SemaRef.Diag(FnDecl->getLocation(), 6342 diag::err_operator_new_delete_declared_in_namespace) 6343 << FnDecl->getDeclName(); 6344 } 6345 6346 if (isa<TranslationUnitDecl>(DC) && 6347 FnDecl->getStorageClass() == SC_Static) { 6348 return SemaRef.Diag(FnDecl->getLocation(), 6349 diag::err_operator_new_delete_declared_static) 6350 << FnDecl->getDeclName(); 6351 } 6352 6353 return false; 6354} 6355 6356static inline bool 6357CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6358 CanQualType ExpectedResultType, 6359 CanQualType ExpectedFirstParamType, 6360 unsigned DependentParamTypeDiag, 6361 unsigned InvalidParamTypeDiag) { 6362 QualType ResultType = 6363 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6364 6365 // Check that the result type is not dependent. 6366 if (ResultType->isDependentType()) 6367 return SemaRef.Diag(FnDecl->getLocation(), 6368 diag::err_operator_new_delete_dependent_result_type) 6369 << FnDecl->getDeclName() << ExpectedResultType; 6370 6371 // Check that the result type is what we expect. 6372 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6373 return SemaRef.Diag(FnDecl->getLocation(), 6374 diag::err_operator_new_delete_invalid_result_type) 6375 << FnDecl->getDeclName() << ExpectedResultType; 6376 6377 // A function template must have at least 2 parameters. 6378 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6379 return SemaRef.Diag(FnDecl->getLocation(), 6380 diag::err_operator_new_delete_template_too_few_parameters) 6381 << FnDecl->getDeclName(); 6382 6383 // The function decl must have at least 1 parameter. 6384 if (FnDecl->getNumParams() == 0) 6385 return SemaRef.Diag(FnDecl->getLocation(), 6386 diag::err_operator_new_delete_too_few_parameters) 6387 << FnDecl->getDeclName(); 6388 6389 // Check the the first parameter type is not dependent. 6390 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6391 if (FirstParamType->isDependentType()) 6392 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6393 << FnDecl->getDeclName() << ExpectedFirstParamType; 6394 6395 // Check that the first parameter type is what we expect. 6396 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6397 ExpectedFirstParamType) 6398 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6399 << FnDecl->getDeclName() << ExpectedFirstParamType; 6400 6401 return false; 6402} 6403 6404static bool 6405CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6406 // C++ [basic.stc.dynamic.allocation]p1: 6407 // A program is ill-formed if an allocation function is declared in a 6408 // namespace scope other than global scope or declared static in global 6409 // scope. 6410 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6411 return true; 6412 6413 CanQualType SizeTy = 6414 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6415 6416 // C++ [basic.stc.dynamic.allocation]p1: 6417 // The return type shall be void*. The first parameter shall have type 6418 // std::size_t. 6419 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6420 SizeTy, 6421 diag::err_operator_new_dependent_param_type, 6422 diag::err_operator_new_param_type)) 6423 return true; 6424 6425 // C++ [basic.stc.dynamic.allocation]p1: 6426 // The first parameter shall not have an associated default argument. 6427 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6428 return SemaRef.Diag(FnDecl->getLocation(), 6429 diag::err_operator_new_default_arg) 6430 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6431 6432 return false; 6433} 6434 6435static bool 6436CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6437 // C++ [basic.stc.dynamic.deallocation]p1: 6438 // A program is ill-formed if deallocation functions are declared in a 6439 // namespace scope other than global scope or declared static in global 6440 // scope. 6441 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6442 return true; 6443 6444 // C++ [basic.stc.dynamic.deallocation]p2: 6445 // Each deallocation function shall return void and its first parameter 6446 // shall be void*. 6447 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6448 SemaRef.Context.VoidPtrTy, 6449 diag::err_operator_delete_dependent_param_type, 6450 diag::err_operator_delete_param_type)) 6451 return true; 6452 6453 return false; 6454} 6455 6456/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6457/// of this overloaded operator is well-formed. If so, returns false; 6458/// otherwise, emits appropriate diagnostics and returns true. 6459bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6460 assert(FnDecl && FnDecl->isOverloadedOperator() && 6461 "Expected an overloaded operator declaration"); 6462 6463 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6464 6465 // C++ [over.oper]p5: 6466 // The allocation and deallocation functions, operator new, 6467 // operator new[], operator delete and operator delete[], are 6468 // described completely in 3.7.3. The attributes and restrictions 6469 // found in the rest of this subclause do not apply to them unless 6470 // explicitly stated in 3.7.3. 6471 if (Op == OO_Delete || Op == OO_Array_Delete) 6472 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6473 6474 if (Op == OO_New || Op == OO_Array_New) 6475 return CheckOperatorNewDeclaration(*this, FnDecl); 6476 6477 // C++ [over.oper]p6: 6478 // An operator function shall either be a non-static member 6479 // function or be a non-member function and have at least one 6480 // parameter whose type is a class, a reference to a class, an 6481 // enumeration, or a reference to an enumeration. 6482 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6483 if (MethodDecl->isStatic()) 6484 return Diag(FnDecl->getLocation(), 6485 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6486 } else { 6487 bool ClassOrEnumParam = false; 6488 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6489 ParamEnd = FnDecl->param_end(); 6490 Param != ParamEnd; ++Param) { 6491 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6492 if (ParamType->isDependentType() || ParamType->isRecordType() || 6493 ParamType->isEnumeralType()) { 6494 ClassOrEnumParam = true; 6495 break; 6496 } 6497 } 6498 6499 if (!ClassOrEnumParam) 6500 return Diag(FnDecl->getLocation(), 6501 diag::err_operator_overload_needs_class_or_enum) 6502 << FnDecl->getDeclName(); 6503 } 6504 6505 // C++ [over.oper]p8: 6506 // An operator function cannot have default arguments (8.3.6), 6507 // except where explicitly stated below. 6508 // 6509 // Only the function-call operator allows default arguments 6510 // (C++ [over.call]p1). 6511 if (Op != OO_Call) { 6512 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6513 Param != FnDecl->param_end(); ++Param) { 6514 if ((*Param)->hasDefaultArg()) 6515 return Diag((*Param)->getLocation(), 6516 diag::err_operator_overload_default_arg) 6517 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6518 } 6519 } 6520 6521 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6522 { false, false, false } 6523#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6524 , { Unary, Binary, MemberOnly } 6525#include "clang/Basic/OperatorKinds.def" 6526 }; 6527 6528 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6529 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6530 bool MustBeMemberOperator = OperatorUses[Op][2]; 6531 6532 // C++ [over.oper]p8: 6533 // [...] Operator functions cannot have more or fewer parameters 6534 // than the number required for the corresponding operator, as 6535 // described in the rest of this subclause. 6536 unsigned NumParams = FnDecl->getNumParams() 6537 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6538 if (Op != OO_Call && 6539 ((NumParams == 1 && !CanBeUnaryOperator) || 6540 (NumParams == 2 && !CanBeBinaryOperator) || 6541 (NumParams < 1) || (NumParams > 2))) { 6542 // We have the wrong number of parameters. 6543 unsigned ErrorKind; 6544 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6545 ErrorKind = 2; // 2 -> unary or binary. 6546 } else if (CanBeUnaryOperator) { 6547 ErrorKind = 0; // 0 -> unary 6548 } else { 6549 assert(CanBeBinaryOperator && 6550 "All non-call overloaded operators are unary or binary!"); 6551 ErrorKind = 1; // 1 -> binary 6552 } 6553 6554 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6555 << FnDecl->getDeclName() << NumParams << ErrorKind; 6556 } 6557 6558 // Overloaded operators other than operator() cannot be variadic. 6559 if (Op != OO_Call && 6560 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6561 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6562 << FnDecl->getDeclName(); 6563 } 6564 6565 // Some operators must be non-static member functions. 6566 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6567 return Diag(FnDecl->getLocation(), 6568 diag::err_operator_overload_must_be_member) 6569 << FnDecl->getDeclName(); 6570 } 6571 6572 // C++ [over.inc]p1: 6573 // The user-defined function called operator++ implements the 6574 // prefix and postfix ++ operator. If this function is a member 6575 // function with no parameters, or a non-member function with one 6576 // parameter of class or enumeration type, it defines the prefix 6577 // increment operator ++ for objects of that type. If the function 6578 // is a member function with one parameter (which shall be of type 6579 // int) or a non-member function with two parameters (the second 6580 // of which shall be of type int), it defines the postfix 6581 // increment operator ++ for objects of that type. 6582 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6583 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6584 bool ParamIsInt = false; 6585 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6586 ParamIsInt = BT->getKind() == BuiltinType::Int; 6587 6588 if (!ParamIsInt) 6589 return Diag(LastParam->getLocation(), 6590 diag::err_operator_overload_post_incdec_must_be_int) 6591 << LastParam->getType() << (Op == OO_MinusMinus); 6592 } 6593 6594 return false; 6595} 6596 6597/// CheckLiteralOperatorDeclaration - Check whether the declaration 6598/// of this literal operator function is well-formed. If so, returns 6599/// false; otherwise, emits appropriate diagnostics and returns true. 6600bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6601 DeclContext *DC = FnDecl->getDeclContext(); 6602 Decl::Kind Kind = DC->getDeclKind(); 6603 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6604 Kind != Decl::LinkageSpec) { 6605 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6606 << FnDecl->getDeclName(); 6607 return true; 6608 } 6609 6610 bool Valid = false; 6611 6612 // template <char...> type operator "" name() is the only valid template 6613 // signature, and the only valid signature with no parameters. 6614 if (FnDecl->param_size() == 0) { 6615 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6616 // Must have only one template parameter 6617 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6618 if (Params->size() == 1) { 6619 NonTypeTemplateParmDecl *PmDecl = 6620 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6621 6622 // The template parameter must be a char parameter pack. 6623 if (PmDecl && PmDecl->isTemplateParameterPack() && 6624 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6625 Valid = true; 6626 } 6627 } 6628 } else { 6629 // Check the first parameter 6630 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6631 6632 QualType T = (*Param)->getType(); 6633 6634 // unsigned long long int, long double, and any character type are allowed 6635 // as the only parameters. 6636 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6637 Context.hasSameType(T, Context.LongDoubleTy) || 6638 Context.hasSameType(T, Context.CharTy) || 6639 Context.hasSameType(T, Context.WCharTy) || 6640 Context.hasSameType(T, Context.Char16Ty) || 6641 Context.hasSameType(T, Context.Char32Ty)) { 6642 if (++Param == FnDecl->param_end()) 6643 Valid = true; 6644 goto FinishedParams; 6645 } 6646 6647 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6648 const PointerType *PT = T->getAs<PointerType>(); 6649 if (!PT) 6650 goto FinishedParams; 6651 T = PT->getPointeeType(); 6652 if (!T.isConstQualified()) 6653 goto FinishedParams; 6654 T = T.getUnqualifiedType(); 6655 6656 // Move on to the second parameter; 6657 ++Param; 6658 6659 // If there is no second parameter, the first must be a const char * 6660 if (Param == FnDecl->param_end()) { 6661 if (Context.hasSameType(T, Context.CharTy)) 6662 Valid = true; 6663 goto FinishedParams; 6664 } 6665 6666 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6667 // are allowed as the first parameter to a two-parameter function 6668 if (!(Context.hasSameType(T, Context.CharTy) || 6669 Context.hasSameType(T, Context.WCharTy) || 6670 Context.hasSameType(T, Context.Char16Ty) || 6671 Context.hasSameType(T, Context.Char32Ty))) 6672 goto FinishedParams; 6673 6674 // The second and final parameter must be an std::size_t 6675 T = (*Param)->getType().getUnqualifiedType(); 6676 if (Context.hasSameType(T, Context.getSizeType()) && 6677 ++Param == FnDecl->param_end()) 6678 Valid = true; 6679 } 6680 6681 // FIXME: This diagnostic is absolutely terrible. 6682FinishedParams: 6683 if (!Valid) { 6684 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6685 << FnDecl->getDeclName(); 6686 return true; 6687 } 6688 6689 return false; 6690} 6691 6692/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6693/// linkage specification, including the language and (if present) 6694/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6695/// the location of the language string literal, which is provided 6696/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6697/// the '{' brace. Otherwise, this linkage specification does not 6698/// have any braces. 6699Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6700 SourceLocation LangLoc, 6701 llvm::StringRef Lang, 6702 SourceLocation LBraceLoc) { 6703 LinkageSpecDecl::LanguageIDs Language; 6704 if (Lang == "\"C\"") 6705 Language = LinkageSpecDecl::lang_c; 6706 else if (Lang == "\"C++\"") 6707 Language = LinkageSpecDecl::lang_cxx; 6708 else { 6709 Diag(LangLoc, diag::err_bad_language); 6710 return 0; 6711 } 6712 6713 // FIXME: Add all the various semantics of linkage specifications 6714 6715 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6716 ExternLoc, LangLoc, Language); 6717 CurContext->addDecl(D); 6718 PushDeclContext(S, D); 6719 return D; 6720} 6721 6722/// ActOnFinishLinkageSpecification - Complete the definition of 6723/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6724/// valid, it's the position of the closing '}' brace in a linkage 6725/// specification that uses braces. 6726Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6727 Decl *LinkageSpec, 6728 SourceLocation RBraceLoc) { 6729 if (LinkageSpec) { 6730 if (RBraceLoc.isValid()) { 6731 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6732 LSDecl->setRBraceLoc(RBraceLoc); 6733 } 6734 PopDeclContext(); 6735 } 6736 return LinkageSpec; 6737} 6738 6739/// \brief Perform semantic analysis for the variable declaration that 6740/// occurs within a C++ catch clause, returning the newly-created 6741/// variable. 6742VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6743 TypeSourceInfo *TInfo, 6744 SourceLocation StartLoc, 6745 SourceLocation Loc, 6746 IdentifierInfo *Name) { 6747 bool Invalid = false; 6748 QualType ExDeclType = TInfo->getType(); 6749 6750 // Arrays and functions decay. 6751 if (ExDeclType->isArrayType()) 6752 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6753 else if (ExDeclType->isFunctionType()) 6754 ExDeclType = Context.getPointerType(ExDeclType); 6755 6756 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6757 // The exception-declaration shall not denote a pointer or reference to an 6758 // incomplete type, other than [cv] void*. 6759 // N2844 forbids rvalue references. 6760 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6761 Diag(Loc, diag::err_catch_rvalue_ref); 6762 Invalid = true; 6763 } 6764 6765 // GCC allows catching pointers and references to incomplete types 6766 // as an extension; so do we, but we warn by default. 6767 6768 QualType BaseType = ExDeclType; 6769 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6770 unsigned DK = diag::err_catch_incomplete; 6771 bool IncompleteCatchIsInvalid = true; 6772 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6773 BaseType = Ptr->getPointeeType(); 6774 Mode = 1; 6775 DK = diag::ext_catch_incomplete_ptr; 6776 IncompleteCatchIsInvalid = false; 6777 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6778 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6779 BaseType = Ref->getPointeeType(); 6780 Mode = 2; 6781 DK = diag::ext_catch_incomplete_ref; 6782 IncompleteCatchIsInvalid = false; 6783 } 6784 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6785 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6786 IncompleteCatchIsInvalid) 6787 Invalid = true; 6788 6789 if (!Invalid && !ExDeclType->isDependentType() && 6790 RequireNonAbstractType(Loc, ExDeclType, 6791 diag::err_abstract_type_in_decl, 6792 AbstractVariableType)) 6793 Invalid = true; 6794 6795 // Only the non-fragile NeXT runtime currently supports C++ catches 6796 // of ObjC types, and no runtime supports catching ObjC types by value. 6797 if (!Invalid && getLangOptions().ObjC1) { 6798 QualType T = ExDeclType; 6799 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6800 T = RT->getPointeeType(); 6801 6802 if (T->isObjCObjectType()) { 6803 Diag(Loc, diag::err_objc_object_catch); 6804 Invalid = true; 6805 } else if (T->isObjCObjectPointerType()) { 6806 if (!getLangOptions().ObjCNonFragileABI) { 6807 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6808 Invalid = true; 6809 } 6810 } 6811 } 6812 6813 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6814 ExDeclType, TInfo, SC_None, SC_None); 6815 ExDecl->setExceptionVariable(true); 6816 6817 if (!Invalid) { 6818 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6819 // C++ [except.handle]p16: 6820 // The object declared in an exception-declaration or, if the 6821 // exception-declaration does not specify a name, a temporary (12.2) is 6822 // copy-initialized (8.5) from the exception object. [...] 6823 // The object is destroyed when the handler exits, after the destruction 6824 // of any automatic objects initialized within the handler. 6825 // 6826 // We just pretend to initialize the object with itself, then make sure 6827 // it can be destroyed later. 6828 QualType initType = ExDeclType; 6829 6830 InitializedEntity entity = 6831 InitializedEntity::InitializeVariable(ExDecl); 6832 InitializationKind initKind = 6833 InitializationKind::CreateCopy(Loc, SourceLocation()); 6834 6835 Expr *opaqueValue = 6836 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6837 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6838 ExprResult result = sequence.Perform(*this, entity, initKind, 6839 MultiExprArg(&opaqueValue, 1)); 6840 if (result.isInvalid()) 6841 Invalid = true; 6842 else { 6843 // If the constructor used was non-trivial, set this as the 6844 // "initializer". 6845 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6846 if (!construct->getConstructor()->isTrivial()) { 6847 Expr *init = MaybeCreateExprWithCleanups(construct); 6848 ExDecl->setInit(init); 6849 } 6850 6851 // And make sure it's destructable. 6852 FinalizeVarWithDestructor(ExDecl, recordType); 6853 } 6854 } 6855 } 6856 6857 if (Invalid) 6858 ExDecl->setInvalidDecl(); 6859 6860 return ExDecl; 6861} 6862 6863/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6864/// handler. 6865Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6866 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6867 bool Invalid = D.isInvalidType(); 6868 6869 // Check for unexpanded parameter packs. 6870 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6871 UPPC_ExceptionType)) { 6872 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6873 D.getIdentifierLoc()); 6874 Invalid = true; 6875 } 6876 6877 IdentifierInfo *II = D.getIdentifier(); 6878 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6879 LookupOrdinaryName, 6880 ForRedeclaration)) { 6881 // The scope should be freshly made just for us. There is just no way 6882 // it contains any previous declaration. 6883 assert(!S->isDeclScope(PrevDecl)); 6884 if (PrevDecl->isTemplateParameter()) { 6885 // Maybe we will complain about the shadowed template parameter. 6886 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6887 } 6888 } 6889 6890 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6891 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6892 << D.getCXXScopeSpec().getRange(); 6893 Invalid = true; 6894 } 6895 6896 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6897 D.getSourceRange().getBegin(), 6898 D.getIdentifierLoc(), 6899 D.getIdentifier()); 6900 if (Invalid) 6901 ExDecl->setInvalidDecl(); 6902 6903 // Add the exception declaration into this scope. 6904 if (II) 6905 PushOnScopeChains(ExDecl, S); 6906 else 6907 CurContext->addDecl(ExDecl); 6908 6909 ProcessDeclAttributes(S, ExDecl, D); 6910 return ExDecl; 6911} 6912 6913Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 6914 Expr *AssertExpr, 6915 Expr *AssertMessageExpr_, 6916 SourceLocation RParenLoc) { 6917 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6918 6919 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6920 llvm::APSInt Value(32); 6921 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6922 Diag(StaticAssertLoc, 6923 diag::err_static_assert_expression_is_not_constant) << 6924 AssertExpr->getSourceRange(); 6925 return 0; 6926 } 6927 6928 if (Value == 0) { 6929 Diag(StaticAssertLoc, diag::err_static_assert_failed) 6930 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6931 } 6932 } 6933 6934 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6935 return 0; 6936 6937 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 6938 AssertExpr, AssertMessage, RParenLoc); 6939 6940 CurContext->addDecl(Decl); 6941 return Decl; 6942} 6943 6944/// \brief Perform semantic analysis of the given friend type declaration. 6945/// 6946/// \returns A friend declaration that. 6947FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6948 TypeSourceInfo *TSInfo) { 6949 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6950 6951 QualType T = TSInfo->getType(); 6952 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6953 6954 if (!getLangOptions().CPlusPlus0x) { 6955 // C++03 [class.friend]p2: 6956 // An elaborated-type-specifier shall be used in a friend declaration 6957 // for a class.* 6958 // 6959 // * The class-key of the elaborated-type-specifier is required. 6960 if (!ActiveTemplateInstantiations.empty()) { 6961 // Do not complain about the form of friend template types during 6962 // template instantiation; we will already have complained when the 6963 // template was declared. 6964 } else if (!T->isElaboratedTypeSpecifier()) { 6965 // If we evaluated the type to a record type, suggest putting 6966 // a tag in front. 6967 if (const RecordType *RT = T->getAs<RecordType>()) { 6968 RecordDecl *RD = RT->getDecl(); 6969 6970 std::string InsertionText = std::string(" ") + RD->getKindName(); 6971 6972 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6973 << (unsigned) RD->getTagKind() 6974 << T 6975 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6976 InsertionText); 6977 } else { 6978 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6979 << T 6980 << SourceRange(FriendLoc, TypeRange.getEnd()); 6981 } 6982 } else if (T->getAs<EnumType>()) { 6983 Diag(FriendLoc, diag::ext_enum_friend) 6984 << T 6985 << SourceRange(FriendLoc, TypeRange.getEnd()); 6986 } 6987 } 6988 6989 // C++0x [class.friend]p3: 6990 // If the type specifier in a friend declaration designates a (possibly 6991 // cv-qualified) class type, that class is declared as a friend; otherwise, 6992 // the friend declaration is ignored. 6993 6994 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6995 // in [class.friend]p3 that we do not implement. 6996 6997 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6998} 6999 7000/// Handle a friend tag declaration where the scope specifier was 7001/// templated. 7002Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7003 unsigned TagSpec, SourceLocation TagLoc, 7004 CXXScopeSpec &SS, 7005 IdentifierInfo *Name, SourceLocation NameLoc, 7006 AttributeList *Attr, 7007 MultiTemplateParamsArg TempParamLists) { 7008 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7009 7010 bool isExplicitSpecialization = false; 7011 bool Invalid = false; 7012 7013 if (TemplateParameterList *TemplateParams 7014 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7015 TempParamLists.get(), 7016 TempParamLists.size(), 7017 /*friend*/ true, 7018 isExplicitSpecialization, 7019 Invalid)) { 7020 if (TemplateParams->size() > 0) { 7021 // This is a declaration of a class template. 7022 if (Invalid) 7023 return 0; 7024 7025 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7026 SS, Name, NameLoc, Attr, 7027 TemplateParams, AS_public, 7028 TempParamLists.size() - 1, 7029 (TemplateParameterList**) TempParamLists.release()).take(); 7030 } else { 7031 // The "template<>" header is extraneous. 7032 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7033 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7034 isExplicitSpecialization = true; 7035 } 7036 } 7037 7038 if (Invalid) return 0; 7039 7040 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7041 7042 bool isAllExplicitSpecializations = true; 7043 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7044 if (TempParamLists.get()[I]->size()) { 7045 isAllExplicitSpecializations = false; 7046 break; 7047 } 7048 } 7049 7050 // FIXME: don't ignore attributes. 7051 7052 // If it's explicit specializations all the way down, just forget 7053 // about the template header and build an appropriate non-templated 7054 // friend. TODO: for source fidelity, remember the headers. 7055 if (isAllExplicitSpecializations) { 7056 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7057 ElaboratedTypeKeyword Keyword 7058 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7059 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7060 *Name, NameLoc); 7061 if (T.isNull()) 7062 return 0; 7063 7064 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7065 if (isa<DependentNameType>(T)) { 7066 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7067 TL.setKeywordLoc(TagLoc); 7068 TL.setQualifierLoc(QualifierLoc); 7069 TL.setNameLoc(NameLoc); 7070 } else { 7071 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7072 TL.setKeywordLoc(TagLoc); 7073 TL.setQualifierLoc(QualifierLoc); 7074 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7075 } 7076 7077 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7078 TSI, FriendLoc); 7079 Friend->setAccess(AS_public); 7080 CurContext->addDecl(Friend); 7081 return Friend; 7082 } 7083 7084 // Handle the case of a templated-scope friend class. e.g. 7085 // template <class T> class A<T>::B; 7086 // FIXME: we don't support these right now. 7087 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7088 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7089 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7090 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7091 TL.setKeywordLoc(TagLoc); 7092 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7093 TL.setNameLoc(NameLoc); 7094 7095 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7096 TSI, FriendLoc); 7097 Friend->setAccess(AS_public); 7098 Friend->setUnsupportedFriend(true); 7099 CurContext->addDecl(Friend); 7100 return Friend; 7101} 7102 7103 7104/// Handle a friend type declaration. This works in tandem with 7105/// ActOnTag. 7106/// 7107/// Notes on friend class templates: 7108/// 7109/// We generally treat friend class declarations as if they were 7110/// declaring a class. So, for example, the elaborated type specifier 7111/// in a friend declaration is required to obey the restrictions of a 7112/// class-head (i.e. no typedefs in the scope chain), template 7113/// parameters are required to match up with simple template-ids, &c. 7114/// However, unlike when declaring a template specialization, it's 7115/// okay to refer to a template specialization without an empty 7116/// template parameter declaration, e.g. 7117/// friend class A<T>::B<unsigned>; 7118/// We permit this as a special case; if there are any template 7119/// parameters present at all, require proper matching, i.e. 7120/// template <> template <class T> friend class A<int>::B; 7121Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7122 MultiTemplateParamsArg TempParams) { 7123 SourceLocation Loc = DS.getSourceRange().getBegin(); 7124 7125 assert(DS.isFriendSpecified()); 7126 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7127 7128 // Try to convert the decl specifier to a type. This works for 7129 // friend templates because ActOnTag never produces a ClassTemplateDecl 7130 // for a TUK_Friend. 7131 Declarator TheDeclarator(DS, Declarator::MemberContext); 7132 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7133 QualType T = TSI->getType(); 7134 if (TheDeclarator.isInvalidType()) 7135 return 0; 7136 7137 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7138 return 0; 7139 7140 // This is definitely an error in C++98. It's probably meant to 7141 // be forbidden in C++0x, too, but the specification is just 7142 // poorly written. 7143 // 7144 // The problem is with declarations like the following: 7145 // template <T> friend A<T>::foo; 7146 // where deciding whether a class C is a friend or not now hinges 7147 // on whether there exists an instantiation of A that causes 7148 // 'foo' to equal C. There are restrictions on class-heads 7149 // (which we declare (by fiat) elaborated friend declarations to 7150 // be) that makes this tractable. 7151 // 7152 // FIXME: handle "template <> friend class A<T>;", which 7153 // is possibly well-formed? Who even knows? 7154 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7155 Diag(Loc, diag::err_tagless_friend_type_template) 7156 << DS.getSourceRange(); 7157 return 0; 7158 } 7159 7160 // C++98 [class.friend]p1: A friend of a class is a function 7161 // or class that is not a member of the class . . . 7162 // This is fixed in DR77, which just barely didn't make the C++03 7163 // deadline. It's also a very silly restriction that seriously 7164 // affects inner classes and which nobody else seems to implement; 7165 // thus we never diagnose it, not even in -pedantic. 7166 // 7167 // But note that we could warn about it: it's always useless to 7168 // friend one of your own members (it's not, however, worthless to 7169 // friend a member of an arbitrary specialization of your template). 7170 7171 Decl *D; 7172 if (unsigned NumTempParamLists = TempParams.size()) 7173 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7174 NumTempParamLists, 7175 TempParams.release(), 7176 TSI, 7177 DS.getFriendSpecLoc()); 7178 else 7179 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7180 7181 if (!D) 7182 return 0; 7183 7184 D->setAccess(AS_public); 7185 CurContext->addDecl(D); 7186 7187 return D; 7188} 7189 7190Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7191 MultiTemplateParamsArg TemplateParams) { 7192 const DeclSpec &DS = D.getDeclSpec(); 7193 7194 assert(DS.isFriendSpecified()); 7195 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7196 7197 SourceLocation Loc = D.getIdentifierLoc(); 7198 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7199 QualType T = TInfo->getType(); 7200 7201 // C++ [class.friend]p1 7202 // A friend of a class is a function or class.... 7203 // Note that this sees through typedefs, which is intended. 7204 // It *doesn't* see through dependent types, which is correct 7205 // according to [temp.arg.type]p3: 7206 // If a declaration acquires a function type through a 7207 // type dependent on a template-parameter and this causes 7208 // a declaration that does not use the syntactic form of a 7209 // function declarator to have a function type, the program 7210 // is ill-formed. 7211 if (!T->isFunctionType()) { 7212 Diag(Loc, diag::err_unexpected_friend); 7213 7214 // It might be worthwhile to try to recover by creating an 7215 // appropriate declaration. 7216 return 0; 7217 } 7218 7219 // C++ [namespace.memdef]p3 7220 // - If a friend declaration in a non-local class first declares a 7221 // class or function, the friend class or function is a member 7222 // of the innermost enclosing namespace. 7223 // - The name of the friend is not found by simple name lookup 7224 // until a matching declaration is provided in that namespace 7225 // scope (either before or after the class declaration granting 7226 // friendship). 7227 // - If a friend function is called, its name may be found by the 7228 // name lookup that considers functions from namespaces and 7229 // classes associated with the types of the function arguments. 7230 // - When looking for a prior declaration of a class or a function 7231 // declared as a friend, scopes outside the innermost enclosing 7232 // namespace scope are not considered. 7233 7234 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7235 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7236 DeclarationName Name = NameInfo.getName(); 7237 assert(Name); 7238 7239 // Check for unexpanded parameter packs. 7240 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7241 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7242 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7243 return 0; 7244 7245 // The context we found the declaration in, or in which we should 7246 // create the declaration. 7247 DeclContext *DC; 7248 Scope *DCScope = S; 7249 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7250 ForRedeclaration); 7251 7252 // FIXME: there are different rules in local classes 7253 7254 // There are four cases here. 7255 // - There's no scope specifier, in which case we just go to the 7256 // appropriate scope and look for a function or function template 7257 // there as appropriate. 7258 // Recover from invalid scope qualifiers as if they just weren't there. 7259 if (SS.isInvalid() || !SS.isSet()) { 7260 // C++0x [namespace.memdef]p3: 7261 // If the name in a friend declaration is neither qualified nor 7262 // a template-id and the declaration is a function or an 7263 // elaborated-type-specifier, the lookup to determine whether 7264 // the entity has been previously declared shall not consider 7265 // any scopes outside the innermost enclosing namespace. 7266 // C++0x [class.friend]p11: 7267 // If a friend declaration appears in a local class and the name 7268 // specified is an unqualified name, a prior declaration is 7269 // looked up without considering scopes that are outside the 7270 // innermost enclosing non-class scope. For a friend function 7271 // declaration, if there is no prior declaration, the program is 7272 // ill-formed. 7273 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7274 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7275 7276 // Find the appropriate context according to the above. 7277 DC = CurContext; 7278 while (true) { 7279 // Skip class contexts. If someone can cite chapter and verse 7280 // for this behavior, that would be nice --- it's what GCC and 7281 // EDG do, and it seems like a reasonable intent, but the spec 7282 // really only says that checks for unqualified existing 7283 // declarations should stop at the nearest enclosing namespace, 7284 // not that they should only consider the nearest enclosing 7285 // namespace. 7286 while (DC->isRecord()) 7287 DC = DC->getParent(); 7288 7289 LookupQualifiedName(Previous, DC); 7290 7291 // TODO: decide what we think about using declarations. 7292 if (isLocal || !Previous.empty()) 7293 break; 7294 7295 if (isTemplateId) { 7296 if (isa<TranslationUnitDecl>(DC)) break; 7297 } else { 7298 if (DC->isFileContext()) break; 7299 } 7300 DC = DC->getParent(); 7301 } 7302 7303 // C++ [class.friend]p1: A friend of a class is a function or 7304 // class that is not a member of the class . . . 7305 // C++0x changes this for both friend types and functions. 7306 // Most C++ 98 compilers do seem to give an error here, so 7307 // we do, too. 7308 if (!Previous.empty() && DC->Equals(CurContext) 7309 && !getLangOptions().CPlusPlus0x) 7310 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7311 7312 DCScope = getScopeForDeclContext(S, DC); 7313 7314 // - There's a non-dependent scope specifier, in which case we 7315 // compute it and do a previous lookup there for a function 7316 // or function template. 7317 } else if (!SS.getScopeRep()->isDependent()) { 7318 DC = computeDeclContext(SS); 7319 if (!DC) return 0; 7320 7321 if (RequireCompleteDeclContext(SS, DC)) return 0; 7322 7323 LookupQualifiedName(Previous, DC); 7324 7325 // Ignore things found implicitly in the wrong scope. 7326 // TODO: better diagnostics for this case. Suggesting the right 7327 // qualified scope would be nice... 7328 LookupResult::Filter F = Previous.makeFilter(); 7329 while (F.hasNext()) { 7330 NamedDecl *D = F.next(); 7331 if (!DC->InEnclosingNamespaceSetOf( 7332 D->getDeclContext()->getRedeclContext())) 7333 F.erase(); 7334 } 7335 F.done(); 7336 7337 if (Previous.empty()) { 7338 D.setInvalidType(); 7339 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7340 return 0; 7341 } 7342 7343 // C++ [class.friend]p1: A friend of a class is a function or 7344 // class that is not a member of the class . . . 7345 if (DC->Equals(CurContext)) 7346 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7347 7348 // - There's a scope specifier that does not match any template 7349 // parameter lists, in which case we use some arbitrary context, 7350 // create a method or method template, and wait for instantiation. 7351 // - There's a scope specifier that does match some template 7352 // parameter lists, which we don't handle right now. 7353 } else { 7354 DC = CurContext; 7355 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7356 } 7357 7358 if (!DC->isRecord()) { 7359 // This implies that it has to be an operator or function. 7360 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7361 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7362 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7363 Diag(Loc, diag::err_introducing_special_friend) << 7364 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7365 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7366 return 0; 7367 } 7368 } 7369 7370 bool Redeclaration = false; 7371 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7372 move(TemplateParams), 7373 IsDefinition, 7374 Redeclaration); 7375 if (!ND) return 0; 7376 7377 assert(ND->getDeclContext() == DC); 7378 assert(ND->getLexicalDeclContext() == CurContext); 7379 7380 // Add the function declaration to the appropriate lookup tables, 7381 // adjusting the redeclarations list as necessary. We don't 7382 // want to do this yet if the friending class is dependent. 7383 // 7384 // Also update the scope-based lookup if the target context's 7385 // lookup context is in lexical scope. 7386 if (!CurContext->isDependentContext()) { 7387 DC = DC->getRedeclContext(); 7388 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7389 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7390 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7391 } 7392 7393 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7394 D.getIdentifierLoc(), ND, 7395 DS.getFriendSpecLoc()); 7396 FrD->setAccess(AS_public); 7397 CurContext->addDecl(FrD); 7398 7399 if (ND->isInvalidDecl()) 7400 FrD->setInvalidDecl(); 7401 else { 7402 FunctionDecl *FD; 7403 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7404 FD = FTD->getTemplatedDecl(); 7405 else 7406 FD = cast<FunctionDecl>(ND); 7407 7408 // Mark templated-scope function declarations as unsupported. 7409 if (FD->getNumTemplateParameterLists()) 7410 FrD->setUnsupportedFriend(true); 7411 } 7412 7413 return ND; 7414} 7415 7416void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7417 AdjustDeclIfTemplate(Dcl); 7418 7419 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7420 if (!Fn) { 7421 Diag(DelLoc, diag::err_deleted_non_function); 7422 return; 7423 } 7424 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7425 Diag(DelLoc, diag::err_deleted_decl_not_first); 7426 Diag(Prev->getLocation(), diag::note_previous_declaration); 7427 // If the declaration wasn't the first, we delete the function anyway for 7428 // recovery. 7429 } 7430 Fn->setDeleted(); 7431} 7432 7433static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7434 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7435 Stmt *SubStmt = *CI; 7436 if (!SubStmt) 7437 continue; 7438 if (isa<ReturnStmt>(SubStmt)) 7439 Self.Diag(SubStmt->getSourceRange().getBegin(), 7440 diag::err_return_in_constructor_handler); 7441 if (!isa<Expr>(SubStmt)) 7442 SearchForReturnInStmt(Self, SubStmt); 7443 } 7444} 7445 7446void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7447 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7448 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7449 SearchForReturnInStmt(*this, Handler); 7450 } 7451} 7452 7453bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7454 const CXXMethodDecl *Old) { 7455 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7456 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7457 7458 if (Context.hasSameType(NewTy, OldTy) || 7459 NewTy->isDependentType() || OldTy->isDependentType()) 7460 return false; 7461 7462 // Check if the return types are covariant 7463 QualType NewClassTy, OldClassTy; 7464 7465 /// Both types must be pointers or references to classes. 7466 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7467 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7468 NewClassTy = NewPT->getPointeeType(); 7469 OldClassTy = OldPT->getPointeeType(); 7470 } 7471 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7472 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7473 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7474 NewClassTy = NewRT->getPointeeType(); 7475 OldClassTy = OldRT->getPointeeType(); 7476 } 7477 } 7478 } 7479 7480 // The return types aren't either both pointers or references to a class type. 7481 if (NewClassTy.isNull()) { 7482 Diag(New->getLocation(), 7483 diag::err_different_return_type_for_overriding_virtual_function) 7484 << New->getDeclName() << NewTy << OldTy; 7485 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7486 7487 return true; 7488 } 7489 7490 // C++ [class.virtual]p6: 7491 // If the return type of D::f differs from the return type of B::f, the 7492 // class type in the return type of D::f shall be complete at the point of 7493 // declaration of D::f or shall be the class type D. 7494 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7495 if (!RT->isBeingDefined() && 7496 RequireCompleteType(New->getLocation(), NewClassTy, 7497 PDiag(diag::err_covariant_return_incomplete) 7498 << New->getDeclName())) 7499 return true; 7500 } 7501 7502 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7503 // Check if the new class derives from the old class. 7504 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7505 Diag(New->getLocation(), 7506 diag::err_covariant_return_not_derived) 7507 << New->getDeclName() << NewTy << OldTy; 7508 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7509 return true; 7510 } 7511 7512 // Check if we the conversion from derived to base is valid. 7513 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7514 diag::err_covariant_return_inaccessible_base, 7515 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7516 // FIXME: Should this point to the return type? 7517 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7518 // FIXME: this note won't trigger for delayed access control 7519 // diagnostics, and it's impossible to get an undelayed error 7520 // here from access control during the original parse because 7521 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7522 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7523 return true; 7524 } 7525 } 7526 7527 // The qualifiers of the return types must be the same. 7528 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7529 Diag(New->getLocation(), 7530 diag::err_covariant_return_type_different_qualifications) 7531 << New->getDeclName() << NewTy << OldTy; 7532 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7533 return true; 7534 }; 7535 7536 7537 // The new class type must have the same or less qualifiers as the old type. 7538 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7539 Diag(New->getLocation(), 7540 diag::err_covariant_return_type_class_type_more_qualified) 7541 << New->getDeclName() << NewTy << OldTy; 7542 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7543 return true; 7544 }; 7545 7546 return false; 7547} 7548 7549/// \brief Mark the given method pure. 7550/// 7551/// \param Method the method to be marked pure. 7552/// 7553/// \param InitRange the source range that covers the "0" initializer. 7554bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7555 SourceLocation EndLoc = InitRange.getEnd(); 7556 if (EndLoc.isValid()) 7557 Method->setRangeEnd(EndLoc); 7558 7559 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7560 Method->setPure(); 7561 return false; 7562 } 7563 7564 if (!Method->isInvalidDecl()) 7565 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7566 << Method->getDeclName() << InitRange; 7567 return true; 7568} 7569 7570/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7571/// an initializer for the out-of-line declaration 'Dcl'. The scope 7572/// is a fresh scope pushed for just this purpose. 7573/// 7574/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7575/// static data member of class X, names should be looked up in the scope of 7576/// class X. 7577void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7578 // If there is no declaration, there was an error parsing it. 7579 if (D == 0) return; 7580 7581 // We should only get called for declarations with scope specifiers, like: 7582 // int foo::bar; 7583 assert(D->isOutOfLine()); 7584 EnterDeclaratorContext(S, D->getDeclContext()); 7585} 7586 7587/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7588/// initializer for the out-of-line declaration 'D'. 7589void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7590 // If there is no declaration, there was an error parsing it. 7591 if (D == 0) return; 7592 7593 assert(D->isOutOfLine()); 7594 ExitDeclaratorContext(S); 7595} 7596 7597/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7598/// C++ if/switch/while/for statement. 7599/// e.g: "if (int x = f()) {...}" 7600DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7601 // C++ 6.4p2: 7602 // The declarator shall not specify a function or an array. 7603 // The type-specifier-seq shall not contain typedef and shall not declare a 7604 // new class or enumeration. 7605 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7606 "Parser allowed 'typedef' as storage class of condition decl."); 7607 7608 TagDecl *OwnedTag = 0; 7609 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7610 QualType Ty = TInfo->getType(); 7611 7612 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7613 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7614 // would be created and CXXConditionDeclExpr wants a VarDecl. 7615 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7616 << D.getSourceRange(); 7617 return DeclResult(); 7618 } else if (OwnedTag && OwnedTag->isDefinition()) { 7619 // The type-specifier-seq shall not declare a new class or enumeration. 7620 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7621 } 7622 7623 Decl *Dcl = ActOnDeclarator(S, D); 7624 if (!Dcl) 7625 return DeclResult(); 7626 7627 return Dcl; 7628} 7629 7630void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7631 bool DefinitionRequired) { 7632 // Ignore any vtable uses in unevaluated operands or for classes that do 7633 // not have a vtable. 7634 if (!Class->isDynamicClass() || Class->isDependentContext() || 7635 CurContext->isDependentContext() || 7636 ExprEvalContexts.back().Context == Unevaluated) 7637 return; 7638 7639 // Try to insert this class into the map. 7640 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7641 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7642 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7643 if (!Pos.second) { 7644 // If we already had an entry, check to see if we are promoting this vtable 7645 // to required a definition. If so, we need to reappend to the VTableUses 7646 // list, since we may have already processed the first entry. 7647 if (DefinitionRequired && !Pos.first->second) { 7648 Pos.first->second = true; 7649 } else { 7650 // Otherwise, we can early exit. 7651 return; 7652 } 7653 } 7654 7655 // Local classes need to have their virtual members marked 7656 // immediately. For all other classes, we mark their virtual members 7657 // at the end of the translation unit. 7658 if (Class->isLocalClass()) 7659 MarkVirtualMembersReferenced(Loc, Class); 7660 else 7661 VTableUses.push_back(std::make_pair(Class, Loc)); 7662} 7663 7664bool Sema::DefineUsedVTables() { 7665 if (VTableUses.empty()) 7666 return false; 7667 7668 // Note: The VTableUses vector could grow as a result of marking 7669 // the members of a class as "used", so we check the size each 7670 // time through the loop and prefer indices (with are stable) to 7671 // iterators (which are not). 7672 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7673 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7674 if (!Class) 7675 continue; 7676 7677 SourceLocation Loc = VTableUses[I].second; 7678 7679 // If this class has a key function, but that key function is 7680 // defined in another translation unit, we don't need to emit the 7681 // vtable even though we're using it. 7682 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7683 if (KeyFunction && !KeyFunction->hasBody()) { 7684 switch (KeyFunction->getTemplateSpecializationKind()) { 7685 case TSK_Undeclared: 7686 case TSK_ExplicitSpecialization: 7687 case TSK_ExplicitInstantiationDeclaration: 7688 // The key function is in another translation unit. 7689 continue; 7690 7691 case TSK_ExplicitInstantiationDefinition: 7692 case TSK_ImplicitInstantiation: 7693 // We will be instantiating the key function. 7694 break; 7695 } 7696 } else if (!KeyFunction) { 7697 // If we have a class with no key function that is the subject 7698 // of an explicit instantiation declaration, suppress the 7699 // vtable; it will live with the explicit instantiation 7700 // definition. 7701 bool IsExplicitInstantiationDeclaration 7702 = Class->getTemplateSpecializationKind() 7703 == TSK_ExplicitInstantiationDeclaration; 7704 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7705 REnd = Class->redecls_end(); 7706 R != REnd; ++R) { 7707 TemplateSpecializationKind TSK 7708 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7709 if (TSK == TSK_ExplicitInstantiationDeclaration) 7710 IsExplicitInstantiationDeclaration = true; 7711 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7712 IsExplicitInstantiationDeclaration = false; 7713 break; 7714 } 7715 } 7716 7717 if (IsExplicitInstantiationDeclaration) 7718 continue; 7719 } 7720 7721 // Mark all of the virtual members of this class as referenced, so 7722 // that we can build a vtable. Then, tell the AST consumer that a 7723 // vtable for this class is required. 7724 MarkVirtualMembersReferenced(Loc, Class); 7725 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7726 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7727 7728 // Optionally warn if we're emitting a weak vtable. 7729 if (Class->getLinkage() == ExternalLinkage && 7730 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7731 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7732 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7733 } 7734 } 7735 VTableUses.clear(); 7736 7737 return true; 7738} 7739 7740void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7741 const CXXRecordDecl *RD) { 7742 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7743 e = RD->method_end(); i != e; ++i) { 7744 CXXMethodDecl *MD = *i; 7745 7746 // C++ [basic.def.odr]p2: 7747 // [...] A virtual member function is used if it is not pure. [...] 7748 if (MD->isVirtual() && !MD->isPure()) 7749 MarkDeclarationReferenced(Loc, MD); 7750 } 7751 7752 // Only classes that have virtual bases need a VTT. 7753 if (RD->getNumVBases() == 0) 7754 return; 7755 7756 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7757 e = RD->bases_end(); i != e; ++i) { 7758 const CXXRecordDecl *Base = 7759 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7760 if (Base->getNumVBases() == 0) 7761 continue; 7762 MarkVirtualMembersReferenced(Loc, Base); 7763 } 7764} 7765 7766/// SetIvarInitializers - This routine builds initialization ASTs for the 7767/// Objective-C implementation whose ivars need be initialized. 7768void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7769 if (!getLangOptions().CPlusPlus) 7770 return; 7771 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7772 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7773 CollectIvarsToConstructOrDestruct(OID, ivars); 7774 if (ivars.empty()) 7775 return; 7776 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7777 for (unsigned i = 0; i < ivars.size(); i++) { 7778 FieldDecl *Field = ivars[i]; 7779 if (Field->isInvalidDecl()) 7780 continue; 7781 7782 CXXCtorInitializer *Member; 7783 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7784 InitializationKind InitKind = 7785 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7786 7787 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7788 ExprResult MemberInit = 7789 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7790 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7791 // Note, MemberInit could actually come back empty if no initialization 7792 // is required (e.g., because it would call a trivial default constructor) 7793 if (!MemberInit.get() || MemberInit.isInvalid()) 7794 continue; 7795 7796 Member = 7797 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7798 SourceLocation(), 7799 MemberInit.takeAs<Expr>(), 7800 SourceLocation()); 7801 AllToInit.push_back(Member); 7802 7803 // Be sure that the destructor is accessible and is marked as referenced. 7804 if (const RecordType *RecordTy 7805 = Context.getBaseElementType(Field->getType()) 7806 ->getAs<RecordType>()) { 7807 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7808 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7809 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7810 CheckDestructorAccess(Field->getLocation(), Destructor, 7811 PDiag(diag::err_access_dtor_ivar) 7812 << Context.getBaseElementType(Field->getType())); 7813 } 7814 } 7815 } 7816 ObjCImplementation->setIvarInitializers(Context, 7817 AllToInit.data(), AllToInit.size()); 7818 } 7819} 7820